Retevis C66 Walkie Talkie User Manual

1. Introduction

This manual provides essential information for the safe and effective operation of your Retevis C66 Walkie Talkie. Please read it thoroughly before use and keep it for future reference.

2. Safety Information

2.1. 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.

2.2. User's Instructions

User's 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.

2.3. FCC Compliance

1. This device complies with part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference. (Licensed radios are applicable);
2. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (Other devices are applicable)
   (1) This device may not cause harmful interference.
   (2) This device must accept any interference received, including interference that may cause undesired operation.
3. 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.

2.4. Disposal

Note: Applicable to electronic products
The crossed-out wheeled-bin symbol on your product, literature, or packaging reminds you that all electrical and electronic products, batteries, or accumulators must be taken to designated collection locations at the end of their working life. Do not dispose of these products as unsorted municipal waste. Dispose of them according to the laws and rules in your area.

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/

2.5. RF Safety

This radio is designed for and classified as “Occupational/Controlled Use Only". Occupational/Controlled environments are defined as locations where there is exposure that may be incurred by people who are aware of the potential of exposure, for example, as a result of employment or occupation. It means a radio must be used only by individuals aware of the hazards, and the ways to minimize such hazards; Not intended for use in a General population/uncontrolled environment.

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.

2.6. Medical Devices

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 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.

• 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.

2.7. Driving Safety

Note: Suitable for handheld or mobile radios

• 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.

2.8. Battery Warnings

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.
• 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.
• Batteries should be removed from the appliance when not being used for long periods of time (one 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.

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.

3. Package Contents

Upon unpacking, please verify that all items are present and in good condition. If any items are missing or damaged, contact your dealer immediately.

Image: Package contents for a single Retevis C66 unit.

Standard Package Includes:

• MateTalk C66 walkie talkie x1
• Base charger x1
• Type-C Charging cable x1
• Battery x1
• Hand Strap x1
• Belt clip x1
• User manual x1
• Adapter x1

4. Product Overview

4.1. Key Descriptions

Image: Detailed view of the Retevis C66 Walkie Talkie with labeled components.

5. Setup

5.1. Unpacking Inspection

Before use, please open the packaging box and carefully inspect the main unit and all included accessories inside. If any items are missing or damaged during transportation, please get in touch with the delivery person or dealer immediately.

5.2. Battery Information and Charging

Charging Precautions: Please charge new or long-unused rechargeable batteries before use. Two to three charge/discharge cycles will optimize battery capacity. When the battery power is low, recharge or replace the battery.

Compatible Battery Types: Please use batteries specified by our company. Using other batteries may result in an explosion and personal injury.

Notes:

1. Do not short-circuit battery terminals or dispose of batteries in a fire. Do not disassemble the battery casing.
2. Charge batteries in an environment between 0 °C and 40 °C. Charging outside this range may affect proper charging.
3. Turn off the walkie-talkie when charging. Using the walkie-talkie during charging may interfere with proper charging.
4. Avoid unplugging the power or battery during the entire charging process to prevent disrupting the charging program.
5. If the usage time significantly decreases even after a full charge, the battery life has ended. Replace it with a new battery.
6. If the battery is fully charged, do not unplug and reinsert it for further charging, as this may shorten or damage the battery life.
7. Do not charge the battery or walkie-talkie when wet. Dry them with a cloth before charging to avoid hazards.
8. Eliminating the Risk, keep away from the flammable materials, heat sources and ignition sources while a battery is charged. Charging should only take place in a well ventilated area and when someone is about to be aware and react to a potential issue.
9. To reduce risk of fire, a battery should not be charged for more than 3 hours and disconnect charger from line voltage (AC outlet) by removing main plug even if the battery is not completely charged. Don't leave a device unattended while charging. Disconnect the charger when the device is fully charged: do not overcharge the device.

Warning: All batteries can cause damage or injury when conductive metals such as jewelry, keys, or chains contact the electrodes. These metals may create a short circuit and generate significant heat. Exercise caution when handling any battery, especially when placing it in pockets, bags, or containers with other metal objects.

Charging Instructions:

1. Insert the standard 5V DC, 2A adapter into a power outlet.
2. Place the battery or the walkie-talkie with the battery into the charging dock.
3. Ensure the battery makes good contact with the charging contacts. The charger indicator turns red to indicate charging has started. For Type-C charging, insert the Type-C plug into the charging port on the right side of the device. A green icon on the device indicates a full charge.

When the charging dock indicator turns green, charging is complete. You may now remove the battery or the walkie-talkie with the battery for use.

Note: Do not use the walkie-talkie during charging. Turn off the walkie-talkie while charging.

Image: Fast charging capabilities and battery life of the Retevis C66.

Image: Flexible charging options for the Retevis C66.

5.3. Accessory Installation

Installing/Removing the Battery: Align the battery pack's positioning posts with the battery slot on the back cover and gently press down on the top of the battery to snap it into place. The battery latch will naturally slide down to secure the battery pack. To remove the battery, push the latch upward to release it.

Installing/Removing the Antenna: Hold the base of the antenna and screw it clockwise into the antenna socket on top of the walkie-talkie until tight. To remove, unscrew it counterclockwise.

Installing/Removing the Belt Clip: If necessary, attach the provided belt clip to the screw hole on the back of the battery pack for convenience. To remove, simply unscrew the two screws.

Installing the Lanyard: Thread the lanyard through the loop in the middle of the walkie-talkie.

Installing Additional Speaker/Microphone Headset: Open the earphone cover and plug the speaker/microphone headset directly into the speaker/microphone jack.

6. Operating Instructions

6.1. Power/Volume Switch

Turn clockwise to power on the walkie-talkie. Turn counterclockwise until a clicking sound is heard to power off. Adjust the volume while turning.

6.2. Channel Selection

Rotate the channel knob to switch channels. Rotating right switches from channel 1 to 16; rotating left switches from 16 to 1.

6.3. PTT Button

Press and hold the PTT button while speaking into the microphone to call the other party. The red indicator lights up. Release to receive signals; the green indicator lights up if a signal is present, activating the speaker.

6.4. Wireless Cloning Function Operation

Transmitting Clone: On channel 2, press side key 1 while powering on to enter clone transmission mode. Press PTT; the red light indicates transmission cloning mode. Manually power off to exit.

Receiving Clone: On channel 2, press side key 1 while powering on to enter clone reception mode. The device will automatically restart after cloning.

Image: One-key Duplicate feature for easy cloning.

6.5. Pairing Compatibility Function Operation

On channel 1, press side key 1 while powering on. After the startup tone ends, release the keys. The walkie-talkie will emit a voice prompt indicating the channel number, followed by a "beep" and the green light turning on, automatically entering pairing compatibility mode. After successful compatibility, it proceeds to the next channel. Press PTT to exit compatibility mode. Note: For better results, keep the devices 0.5 meters apart during compatibility mode. A restart is required after compatibility for normal use.

Image: One-key Pairing feature.

6.6. Customizable Functions for Side Keys 1 and 2

Side keys can be customized for long and short press functions via programming software or menus. Options include: no function, scan, alarm, monitor, VOX, frequency reverse, power adjustment, and offline.

Image: Emergency Alarm activated by Side Key 1.

6.7. Squelch Level

The squelch level controls the signal strength required to open the audio output. Lower levels allow more background noise and longer range, but weaker interference resistance. Higher levels require stronger signals, offering better interference resistance but shorter range. The default setting is level 5 (range: 0-9, with 0 being squelch always on). Adjust via the "Squelch Level" option in the programming software menu.

6.8. Power-Saving Function

On: After 10 seconds of inactivity, the device automatically enters power-saving mode (multiple power-saving modes available in the programming software). The device can still receive messages in this mode.

Off: The device does not enter power-saving mode.

6.9. VOX Function

VOX allows transmission without pressing the PTT key by using voice activation. Speaking activates transmission; silence stops it. This function can be enabled/disabled via programming software. When VOX is enabled:

1. When your radio has the VOX function enabled. Speaking into the MIC will automatically initiate transmission and send your voice. When you stop speaking, the radio will automatically cease transmission and await reception.
2. When using a headset microphone. To use the voice-activated function, you must adjust the VOX gain to set the level at which the radio detects sound. If the microphone is too sensitive, ambient noise may cause the radio to start transmitting. If the microphone is not sensitive enough, the radio will not pick up your voice, so it is essential to adjust the VOX gain level to ensure smooth communication.

Note: When the VOX gain is set to a high, more sensitive level, connecting a speaker/microphone to the radio may cause the amplified received signal to trigger transmission. (The VOX gain level must be set through the programming software.)

6.10. Battery Voltage Detection

Low Battery Alert: When the voltage drops below a certain level, a voice prompt "Please charge" will sound approximately every 15 seconds.

6.11. TOT (Time-Out Timer)

Set the maximum continuous transmission time per PTT press in the programming software to prevent accidental or prolonged channel occupation. The device will automatically stop transmitting after the set time.

6.12. Monitor Function

Set via programming software to a customizable key for assisting in receiving weak signals. Pressing the key forces the walkie-talkie to open the receive channel, outputting weak signals to the speaker for user discernment. This function temporarily bypasses CTCSS/DCS settings, allowing reception of communications normally restricted by CTCSS/DCS.

6.13. Voice Prompt

English voice prompt provides feedback for key presses. Prompt includes channel numbers and key functions. Can be disabled via software; enabled by default.

6.14. NOAA Weather Channel

This function can be set as a custom button via the programming software to turn the NOAA weather channel mode on or off. Pressing the designated custom button will enter NOAA mode, where you can select the desired NOAA channel by rotating the channel knob. Pressing the custom button again will exit NOAA mode.

Note: Once NOAA mode is activated, the radio will only receive weather channels and will not receive regular communication channels. Normal communication can only be restored by exiting NOAA mode.

6.15. Roger Beep

Set via programming software to emit a beep on the receiving walkie-talkie when the PTT button is released, indicating the end of the current call.

6.16. Single Tone Signaling

Set via programming software to send a specific single-tone signal to activate a dormant repeater, restoring communication channel operation.

6.17. Offline Mode

In standby mode, users can toggle offline mode using a shortcut key. In offline mode, the transmit frequency automatically matches the receive frequency for direct point-to-point communication without a repeater. Disabling offline mode restores the transmit frequency to the preset different frequency state, resuming repeater-based communication. Note: This function enables direct communication in environments without a repeater, allowing flexible switching of communication modes.

6.18. Wide/Narrow Band Selection (25.0KHz/12.5KHz)

The default setting is wideband (25.0KHz). Select the operating bandwidth (wideband or narrowband at 12.5KHz) for each channel via the "Wide/Narrow" option in the programming software.

6.19. Busy Lockout

If enabled, pressing PTT while receiving a signal prohibits transmission and emits a "beep" until PTT is released. Can be set via programming software.

6.20. High/Low Power Selection

The default setting is high power. Select the operating power (high or low) for each channel via the "Power" option in the programming software.

6.21. Scan Function

When set to scannable via programming software, pressing side key 1 initiates scanning. The walkie-talkie automatically detects activity on channels 1 to 30, defined as scannable (configurable via programming software). When a signal is detected on a scanned channel, the walkie-talkie stops on that channel for communication.

Note:

1. The walkie-talkie will remain on the channel with a signal until the signal disappears, then resume scanning after approximately 10 seconds.
2. Scanning is not possible with fewer than two scannable channels.

6.22. Remote Alarm

Set the side key to the remote alarm function via programming software. Pressing and holding the side key for three seconds activates the emergency alarm. Pressing PTT during the alarm deactivates it.

6.23. TYPE-C Charging Function

Open the earphone cover and insert the Type-C charging cable to charge the device. The indicator light turns red during charging and green when fully charged. Note: Turn off the walkie-talkie while charging. If the indicator light is green upon initial insertion, check the battery contact with the device's power socket.

7. Maintenance and Cleaning

• Do not hold the antenna or external microphone directly.
• Wipe dust and stains off the walkie-talkie with a lint-free cloth to prevent poor contact.
• Cover the earphone jack when the walkie-talkie is not in use.
• After prolonged use, keys, control dials, and the casing may become dirty. Clean them with a mild detergent (avoid strong corrosive chemicals) and a damp cloth.

8. Troubleshooting

If you encounter issues with your Retevis C66 Walkie Talkie, please refer to the following common problems and solutions:

• No Power: Ensure the battery is correctly installed and charged. Check the power/volume knob is turned clockwise to the 'on' position.
• Cannot Transmit or Receive: Verify that the channel is correctly selected and that you are within range of other radios or repeaters. Check if Busy Lockout is enabled.
• Poor Audio Quality: Adjust the volume. Ensure the microphone and speaker are clear of obstructions. Check squelch level settings.
• Battery Drains Quickly: Ensure the battery is fully charged. If the battery life has significantly decreased even after a full charge, it may need replacement. Consider enabling the power-saving function.
• Charging Issues: Ensure the charger and cable are properly connected. Check if the charging indicator light is red during charging and green when complete. If the light is green upon initial insertion, check battery contact.
• Interference: If experiencing interference, try changing channels or adjusting the squelch level. Ensure you are not in an area with strong electromagnetic interference.

For more complex issues, please contact Retevis customer support.

9. User Tips

No specific user tips were available from provided reviews or Q&A content. However, general tips for walkie-talkie use include:

• Maximize Battery Life: Utilize the power-saving feature and avoid overcharging.
• Clear Communication: Speak clearly and directly into the microphone. Adjust the VOX gain carefully if using voice activation.
• Range Optimization: For extended range, especially in challenging environments, consider using a repeater if available.
• Regular Cleaning: Keep the device clean, especially contacts and ports, to ensure reliable operation.

10. Specifications

10.1. General Specifications

10.2. Transmission

10.3. Reception

10.4. Weather Channel and Frequency Table

10.5. GMRS Channel and Frequency Table

10.6. CTCSS and DCS Lists

The following tables provide the CTCSS (Continuous Tone-Coded Squelch System) and DCS (Digitally Coded Squelch) codes for configuring your walkie-talkie channels.

CTCSS CHART (Hz)

DCS CODELIST

11. Warranty and Support

11.1. Guarantee

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. Further details can be found at http://www.retevis.com/after-sale/

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

Exclusions from Warranty Coverage:

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

11.2. Authorized Accessories List

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

11.3. Item Guides & Documents

A user manual in PDF format is available for download. You can reference it here: Retevis C66 User Manual (PDF)