RETEVIS H777H Walkie Talkie User Manual

1. Introduction

This manual provides comprehensive instructions for the safe and efficient operation of your Retevis H777H Walkie Talkie. Please read this guide thoroughly before using the device to ensure proper functionality and to understand all features.

2. Safety Information

RF Energy Exposure and Product Safety Guide

Before using this device, please read this guide which contains important operating instructions for safe usage, control information and operational instructions for compliance with RF Energy Exposure limits in applicable national and international standards. User instructions should accompany the device when transferred to other users.

Changes or modifications not expressly approved by the party responsible for compliance may void the user's authority granted by the local government radio management departments to operate this radio and should not be made. To comply with the corresponding requirements, transmitter adjustments should be made only by or under the supervision of a person certified as technically qualified to perform transmitter maintenance and repairs in the private land mobile and fixed services as certified by an organization representative of the user of those services. Replacement of any transmitter component (crystal, semiconductor, etc.) not authorized by the local government radio management departments equipment authorization for this radio could violate the rules.

(1) This device may not cause harmful interference.
(2) This device must accept any interference received, including interference that may cause undesired operation.

Note: This equipment has been tested and found to comply with the limits for a Class B digital device. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

This device contains licence-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Development Canada's licence-exempt RSS(s). Operation is subject to the following two conditions:

(1) This device may not cause interference.
(2) This device must accept any interference, including interference that may cause undesired operation of the device.

RF Safety

This two-way radio uses electromagnetic energy in the radio frequency (RF) spectrum to provide communications between two or more users over a distance. RF energy, which when used improperly, can cause biological damage. Please refer to the following websites for more information on what RF energy exposure is and how to control your exposure to assure compliance with established RF exposure limits: http://www.who.int/en/

Energy exposure only when transmitting in terms of measuring for standards compliance. For users who wish to further reduce their exposure, some effective measures to reduce RF exposure include:

• Reduce the amount of time spent using your wireless device.
• Use a speakerphone, earpiece, headset, or other hands-free accessory to reduce proximity to the head (and thus head exposure). While wired earpieces may conduct some energy to the head and wireless earpieces also emit a small amount of RF energy, both wired and wireless earpieces remove the greatest source of RF energy (handheld device) from proximity to the head and thus can greatly reduce total exposure to the head.
• Increase the distance between wireless devices and your body.

This radio is designed for and classified as “General population/uncontrolled use". General population/uncontrolled environments are defined as locations where there is exposure of individuals who have no knowledge or control of RF exposure level. To control your exposure and ensure compliance with the controlled environment exposure limits, always adhere to the following procedure:

• To receive calls, release the PTT button.
• To transmit (talk), press the Push-to-Talk (PTT) button in front of the face.
• Hold the radio in a vertical position with the microphone (and other parts of the radio including the antenna) at least one inch (2.5 centimeters) away from the nose or lips.

Nearly every electronic device is susceptible to electromagnetic interference (EMI) if inadequately shielded, designed, or otherwise configured for electromagnetic compatibility. During transmissions, your radio generates RF energy that can possibly cause interference with other devices or systems. To avoid such interference, turn off the radio in areas where signs are posted to do so, such as hospitals or healthcare facilities.

Persons with pacemakers, implantable cardioverter defibrillators (ICDs) or other active implantable medical devices should:

• Consult with their physicians regarding the potential risk of interference from radio frequency transmitters, such as portable radios (poorly shielded medical devices may be more susceptible to interference).
• Turn the radio OFF immediately if there is any reason to suspect that interference is taking place.
• Do not carry the radio in a chest pocket or near the implantation site, and carry or use the radio on the opposite side of the body from the implantable device to minimize the potential for interference.

Hearing Aids: Some digital wireless radios may interfere with some hearing aids. In the event of such interference, you may want to consult your hearing aid manufacturer to discuss alternatives.

Other Medical Devices: If you use any other personal medical device, consult the manufacturer of your device to determine if it is adequately shielded from RF energy. Your physician may be able to assist you in obtaining this information.

Turn off your radio in the following conditions:

• Turn off your radio prior to entering any area with a potentially hazardous or explosive atmosphere. Only radio types that are especially qualified should be used in such areas as “Intrinsically Safe".

Note: the areas with potentially explosive atmosphere referred to above include blasting caps, blasting areas, inflammable gas, dust particles, metallic powders, grain powders, fueling areas such as below decks on boats, fuel or chemical transfer or storage facilities, areas where the air contains chemicals or particles (such as grain, dust or metal powders) and any other area where you would normally be advised to turn off your vehicle engine. Areas with potentially explosive atmospheres are often – but not always posted.

• Turn off your Radiocommunication device when taking on fuel or parked at gasoline service stations.
• Turn off your radio when on board an aircraft. Any use of a radio must be in accordance with applicable regulations per airline crew instructions.
• Do not use any radio that has a damaged antenna. If a damaged antenna comes into contact with the skin when the radio is in use, a burn can result.
• Turn off your radio before removing or installing accessories.
• When the transceiver is used for long transmissions, the radiator and chassis will become hot.

Always check the laws and regulations on the use of radios in the areas where you drive. Use of Communication Devices, for example, mobile radio, may not be allowed.

• Give full attention to driving and to the road.
• Use hands-free operation, if available.
• Pull off the road and park before making or answering a call, if driving conditions or regulations so require.
• Do not place a portable radio in the area over an air bag or in the airbag deployment area. The radio may be propelled with great force and cause serious injury to occupants of the vehicle when the airbag inflates.

Use the lowest volume necessary to do your job. Turn up the volume only if you are in noisy surroundings.

• Limit the amount of time you use headsets or earpieces at high volume.
• When using the radio without a headset or earpiece, do not place the radio's speaker directly against your ear.
• Use carefully with the earphone maybe possible excessive sound pressure from earphones and headphones can cause hearing loss.

CAUTION: Exposure to loud noises from any source for extended periods of time may temporarily or permanently affect your hearing. The louder the radio's volume, the less time is required before your hearing could be affected. Hearing damage from loud noise is sometimes undetectable at first and can have a cumulative effect.

WARNING: KEEP NEW OR OLD USED BATTERIES OUT OF REACH OF CHILDREN.

• In the event of a battery leaking, do not allow the liquid to come into contact with the skin or eyes. If contact has been made, wash the affected area with copious amounts of water and seek medical advice immediately.
• If a radio or a battery has been submerged in water, please dry and clean it before use. Do not dry the radio or battery with an appliance or heat source, such as a hair dryer or microwave oven. If the radio has been submersed in a corrosive substance (e.g. saltwater), rinse the radio and battery in fresh water, then dry them.
• Since batteries are sensitive to high temperatures when storing them, keep them in a cool and dry place. The recommended temperature should be between +10 °C and +25 °C and never exceed +30 °C. Batteries should therefore not be stored next to radiators or boilers nor in direct sunlight. Extremes of humidity (below 35% and above 95% relative humidity for sustained periods should be avoided since they are detrimental to both batteries and packing. Although the storage life of batteries at room temperature is good, storage is improved at lower temperatures provided special precautions are taken. Also, accelerated warming is harmful.

Leaving a battery in an extremely high temperature surrounding environment that can result in an explosion or the leakage of flammable liquid or gas; A battery subjected to extremely low air pressure may result in an explosion or the leakage of flammable liquid or gas.

Turn off your radio before removing or installing a battery. Store spare batteries securely. Dispose of used batteries immediately and safely.

• The battery supply terminals are not to be short-circuit.
• Do not replace the battery in any area labeled “Hazardous Atmosphere". Any sparks created in a potentially explosive atmosphere can cause explosion or fire.
• When the conductive material such as jewelry, keys or chains touches exposed terminals of the batteries, may complete an electrical circuit (short circuit the battery) and become hot to cause bodily injury such as burns. Exercise care in handling any battery, particularly when placing it inside a pocket, purse or other container with metal objects;
• Dirty battery contacts need to be wiped with clean dry cloth, both on the battery and in the appliance.
• Batteries should be removed from the appliance when not being used for long periods of time (months). The batteries should be enclosed in special protective packaging (such as sealed plastic bags or variants) which should be retained to protect them from condensation during the time they are warming to ambient temperature.
• Exhausted batteries are to be removed from the equipment.
• Do not dismantle, open or shred batteries. Batteries should be dismantled only by trained people.
• Disposal of a battery into fire, or a hot oven, or mechanically crushing or cutting of a battery, that can result in explosion;
• Turn off your radio before charging.
• Batteries shall be charged at 10℃~40℃ environment temperature specified. If the environment temperature is lower than 0°C, the charge shall be prohibited.
• Rechargeable batteries need to be charged with a dedicated charger provided for each piece of equipment before you first use them.
• Rechargeable batteries are only to be charged by adults or by children at least 8 years old under adult supervision.
• Pull by the plug rather than the cord when disconnecting the charger.
• Unplug the charger from the AC outlet before attempting any maintenance or cleaning.

Do not use the charger outdoors or in moist environments, use only in dry locations/conditions.

• Do not disassemble the charger, which may result in a risk of electrical shock or fire. A charger should be dismantled only by trained people.
• Do not operate the charger if it has been broken or damaged in any way.
• An extension cord should not be used unless absolutely necessary. Use of an improper extension cord could result in a risk of a fire and/or electric shock. If an extension cord must be used, make sure that:
• The pins on the plug of the extension cord are the same number, size and shape as those on the plug of the charger.
• The extension cord is properly wired and in good condition.
• Make sure the cord is located so it will not be stepped on, tripped over or subjected to damage or stress.

WARNING: CHOKING HAZARD - Small Parts. Not suitable for children under 3 years old.

The plug of the adapter is considered a disconnect device. The socket-outlet shall be installed near the equipment and shall be easily accessible.

• Contact Retevis for assistance regarding repairs and service.
• For a list of Retevis-approved accessories for your radio model, visit the website: http://www.Retevis.com

3. Package Contents

1PC Package Includes:

• H777H two-way radio x1
• Battery x1
• Charging base x1
• Type-C charging cable x1
• Belt clip x1
• User manual x1

Figure: 1PC Package Contents

2PCS Package Includes:

• H777H two-way radio x2
• Battery x2
• Charging base x2
• Type-C charging cable x2
• Belt clip x2
• User manual x2
• Optional: Earphone x2

Figure: 2PCS Package Contents

4. Familiarization with the Radio

Understand the different parts and controls of your H777H Walkie Talkie.

Figure: H777H Walkie Talkie Parts Diagram

Controls and Functions:

• A. PTT (PUSH-TO-TALK) Key: Press to transmit, release to receive.
• B. UP Key: Short press for Channel lock, long press for Emergency alarm.
• C. Down Key: Short press for Flashlight, long press for VOX.
• D. LED Torch: Integrated flashlight.
• E. Speaker: For audio output.
• F. Mic: For voice input.
• G. Hidden Display: Shows battery and channel information.
• H. Channel Knob: Rotate to select channels (1-16). Channel 16 is the scanning channel.
• I. POWER/VOLUME Knob: Clockwise to turn on/adjust volume, anticlockwise to turn off.
• J. LED Indicator: Red when transmitting, green when receiving.
• K. SPEAKER/MICROPHONE JACKS: For external audio accessories (compatible with 2-pin K plug).

5. Charging the Battery

Charging Attentions (1):

• The Li-ion battery does not charge at the factory. Charge first at 5-40°C.
• After purchasing or storing for over 2 months, the battery may not reach full capacity initially. Charge and discharge two or three times to achieve normal capacity.
• Turn off the radio before charging. Do not use the radio during charging to prevent accidents.
• After fully charged, remove the Li-ion battery from the charging base (or unplug the USB adapter). Overcharging shortens battery life. Do not charge the battery before it runs out of power to avoid damaging battery memory.
• The battery life does not increase with correct charging; it refers to the battery's overall lifespan. Replace the battery if its use time is significantly reduced.

Charging Attentions (2):

• Plug the fire bull output adapter into the socket behind the charger, then into AC 110-220V power. The charger indicator lights up green.
• Place the Li-ion battery or the entire radio into the charger, ensuring proper connection with the charging terminal. The indicator lights up red when charging. It turns green when fully charged.

Note: The radio can be charged using the desktop charger or directly via the Fire Bull adapter's USB charging port. For direct charging, plug the Fire Bull adapter into AC 110-220V power, then plug the Type-C charging cable into the radio's Type-C port. The indicator lights up red when charging and green when fully charged.

Figure: Type-C Charging Options

6. Basic Operations

Power/Volume Knob

• Rotate the knob clockwise until you hear a click sound to turn on the radio.
• Rotate the knob anticlockwise until you hear a click sound to turn off the radio.
• In the power-on state, rotate the volume knob to adjust the volume.

Channel Selection

• Rotate the Channel Knob clockwise to increase the channel from 1-16.
• Rotate the Channel Knob anticlockwise to decrease the channel from 16-1.
• When receiving a signal, the indicator lights up green and the speaker outputs the voice.

PTT Key (Push-to-Talk)

Press the PTT key and keep the microphone 3-8cm away from your mouth. Speak in a normal voice to ensure the receiver gets the best communication audio.

Monitor

The monitor function allows users to receive communication from the specified channel. In the power-on state, define the UP or Down key as the Monitor through the CPS (Customer Programming Software).

Scan

In the power-on state, define the UP or Down key as the Scan through the CPS. Long press the side key for 2.5s to hear the ON prompt, and channels 1-16 will auto-increment to enter scan mode. The radio will start scanning from the current channel. When scanning a matched carrier and CTCSS/DCS signal, communication is achieved. If the PTT key is not pressed or no signal is received within 4s, the radio will continue to scan. In scan mode, long press the key for 2.5s to hear the OFF prompt, and the radio exits scan mode. (Note: if fewer than 2 channels are added, the radio cannot scan).

• Carrier scan: When the radio detects a signal, it will stop scanning and remain on that frequency until the signal disappears. There is a 4-second delay between the disappeared signal and scan restoration.

VOX Function (Voice Operated Exchange)

The VOX function allows you to transmit by speaking into the radio without pressing the PTT key. In the power-on state, long press the Down key for 2.5s to hear the prompt VOX-ON/OFF.

• VOX level refers to the voice sensitivity of the radio. Levels 1-9 can be selected through the CPS. If you choose OFF, the VOX function cannot be turned on manually. Level 9 is the most sensitive.

Figure: VOX Hands-free Operation

Channel Lock

Long press the UP key for 2.5s to hear two beep sounds, and the channel lock turns on. When this function is on, the channel knob is valid. Long press the key for 2.5s again to hear a beep sound, and the channel lock turns off.

Emergency Alarm

Long press the UP key for 2.5s to turn on the alarm function. The corresponding channel radio will receive the alarm signal and hear the alarm sound from the radio. Press the PTT key to exit.

Figure: Emergency Alarm Activation

Flashlight

Shortly press the Down key to turn on the LED flashlight. Shortly press the Down key again to turn it off.

Figure: LED Flashlight in Use

Battery and Channel Display

Check the battery level and current channel through the hidden display.

Figure: Hidden Display

High/Low Power Selection

Set high/low power. FRS radios switch high/low power through the CPS. PMR446 radios do not have high/low power selection.

Busy Channel Lockout

This function prevents blocking other conversations on the same channel. Users can set it through the CPS. If set to Yes, the channel receives the signal, but if you press the PTT key, the radio cannot transmit and sends a toot sound. If set to No, this situation will not occur.

Battery Save

When the radio has no received signal in receive state, it reduces battery power consumption by reducing the receive circuit. This extends the use time after being fully charged. The function can be checked in the Battery Save setting of the CPS.

Low Battery Alert

When battery power is low, the radio will send a voice prompt if it has voice broadcasting. The radio will prohibit transmitting when the low battery alert appears. Please change or charge the battery.

Figure: Low Battery Alert

TOT (Time-Out Timer)

TOT prevents using a channel for too long. TOT time can be set through the CPS (30s, 60s, ..., 180s; interval is 30s). If you continuously transmit to TOT time, the radio will stop transmitting and send a warning sound. To stop the warning sound, release the PTT key. Press the PTT key again to restore transmission.

CTCSS/DCS

The radio offers 50 CTCSS and 210 DCS codes. It is effective to set DCS codes on the channel (or no setting is valid). The function has common signaling and special signaling options. Common signaling means the DCS codes on the channel are normal, allowing communication with other radios set to the same DCS codes.

One-key Pairing

Adjust the radio channel to 1 and turn off the radio. Press the UP key and turn on the radio. The indicator slowly lights up green, and the radio enters pairing mode. Any radio transmits, when the radio receives the signal and two radios talk normally, a channel pairs successfully. Switch channels to pair continuously. After finishing, turn on the radio again to use it normally.

Figure: One-key Pairing

7. User Tips

• Output Power: The H777H model has an output power of 2W/0.5W. Ensure your local regulations permit this power level for your intended use (PMR446 is typically 0.5W, FRS can be higher).
• Hidden Display: Utilize the hidden display to quickly check your current channel and battery status without needing to activate a full screen.
• VOX Hands-free: For situations where you need to communicate without using your hands, enable the VOX function. Adjust the VOX sensitivity (levels 1-9) via the CPS for optimal performance in different environments.
• One-Key Pairing: This feature simplifies connecting with other radios. If you're using multiple H777H units or compatible H777 models, use one-key pairing for quick setup.
• Charging: Always ensure the radio is turned off during charging to prevent damage and ensure efficient battery charging.

8. Specifications

General Specifications

Transmit Specifications

Receive Specifications

Note: If the specifications change due to technology improvement, users will not be informed again.

Figure: Model Comparison (H777, H777H, H777D)

9. Frequency Allocation (FRS 16H)

10. Maintenance

Battery Care:

• Do not dismantle, open, or shred batteries.
• Avoid disposing of batteries in fire or a hot oven, or mechanically crushing or cutting them, as this can result in an explosion.
• Always charge batteries within the specified environment temperature of 10℃~40℃. Charging below 0°C is prohibited.
• Use only the dedicated charger provided for rechargeable batteries.
• Rechargeable batteries should only be charged by adults or children aged 8 years or older under adult supervision.
• When disconnecting the charger, pull by the plug, not the cord.
• Unplug the charger from the AC outlet before any maintenance or cleaning.

General Care:

• Do not use the charger outdoors or in moist environments; use only in dry locations/conditions.
• Do not disassemble the charger. Only trained personnel should dismantle it to avoid electrical shock or fire.
• Do not operate the charger if it has been broken or damaged.
• Avoid using an extension cord unless absolutely necessary. If used, ensure it is properly wired, in good condition, and not subjected to damage or stress.
• Keep the product away from children, especially small parts which can be a choking hazard.

11. Troubleshooting

This section provides solutions to common issues you might encounter with your Retevis H777H Walkie Talkie.

Common Issues & Solutions:

• Radio not turning on: Ensure the battery is charged and properly inserted. Rotate the Power/Volume knob clockwise until a click is heard.
• Cannot transmit or receive: Check if the radio is on the correct channel. Ensure the PTT button is pressed correctly for transmitting. Verify that the antenna is not damaged. If Busy Channel Lockout is enabled and the channel is in use, you will not be able to transmit.
• Poor audio quality: Adjust the volume using the Power/Volume knob. Ensure the microphone is 3-8cm from your mouth during transmission. Check for environmental noise and adjust squelch levels if programmable via CPS.
• Battery drains quickly: Ensure the battery is fully charged before use. Check if Battery Save mode is enabled via CPS. If the battery is old, consider replacing it as its capacity may have degraded.
• Emergency Alarm activates unintentionally: Ensure the UP key is not being long-pressed accidentally. Press the PTT key to exit the alarm.
• Flashlight not working: Short press the Down key to toggle the flashlight. If it doesn't work, ensure the battery has sufficient charge.
• Interference: If experiencing interference, try changing channels. Ensure you are not in an area with high electromagnetic interference.

12. Warranty & Support

Warranty Information:

This guarantee card should be kept by the user; no replacement if lost. Most new products carry a two-year manufacturer's warranty from the date of purchase. For further details, please read http://www.retevis.com/after-sale/

The user can get warranty and after-sales service as below:

• Contact the seller where you buy.
• Products Repaired by Our Local Repair Center.

For warranty service, you will need to provide a receipt proof of purchase from the actual seller for verification.

Exclusions from Warranty Coverage:

• To any product damaged by accident.
• In the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs.
• If the serial number has been altered, defaced, or removed.

Contact & Support:

For assistance regarding repairs and service, or for a list of Retevis-approved accessories for your radio model, visit the website: http://www.Retevis.com

Shenzhen Retevis Technology Co.,Ltd.
7/F, 13-C, Zhonghaixin Science & Technology Park, No.12 Ganli 6th Road, Jihua Street, Longgang District, Shenzhen, China
Web: www.retevis.com
E-mail: info@retevis.com
Facebook: @retevis.fans