1. Introduction
The KSUN P85 is a robust, handheld VHF marine radio designed for reliable communication in marine environments. Featuring IP68 waterproofing, a large LED screen, and a high-capacity 8000mAh battery, this radio is suitable for various water-related activities and professional maritime use. It supports international marine channels, ensuring clear and consistent communication.

Image 1.1: The KSUN P85 Handheld VHF Marine Radio, showcasing its compact and durable design.
2. Product Features
- IP68 Waterproof: Designed to withstand immersion in water, ensuring reliable operation in wet conditions.
- 8000mAh Battery: Equipped with a high-capacity rechargeable battery for extended use, typically supporting 4-5 days of daily operation.
- Large LED Screen: A clear display shows current channel, battery status, and signal strength for intuitive operation.
- International Marine Channels: Access to 16 channels, including US, Canadian, and international marine VHF channels.
- Voice Control Function: Allows for hands-free operation in certain modes.
- HD Sound Quality: Provides clear audio for effective communication.
- Frequency Hopping Scrambling: Enhances communication security.
- CTSS/DCS: Supports Continuous Tone-Coded Squelch System and Digital-Coded Squelch for interference reduction.

Image 2.1: Visual representation of key features including IP68 protection, V-segment marine band, HD sound, voice control, scrambling/hopping, and low power reminder.
3. Package Contents
Upon opening the package, please verify that all the following items are included:
- KSUN P85 Radio Unit
- 8000mAh Lithium-Ion Battery
- AC Charger Adapter
- Cradle Charger
- Antenna
- Belt Clip
- Lanyard
- User Manual

Image 3.1: All components included in the KSUN P85 package: radio, battery, charger, antenna, belt clip, and manual.
3.1 Unboxing Video
Video 3.1: An unboxing video demonstrating the contents of the KSUN P85 marine intercom package and initial handling.
4. Product Overview
Familiarize yourself with the various parts of your KSUN P85 radio:

Image 4.1: Diagram illustrating the main components of the KSUN P85 radio, including the antenna, channel selection knob, switch/volume knob, PTT key, function keys, MIC/SP jack, and hidden screen.
- Antenna: For transmitting and receiving signals.
- Channel Selection Knob: Used to select desired communication channels.
- Switch/Volume Knob: Turns the radio on/off and adjusts the audio volume.
- PTT Key (Push-to-Talk): Press and hold to transmit, release to receive.
- Function Keys: Programmable keys for various radio functions.
- MIC/SP Jack: Port for external microphone or speaker accessories.
- Hidden Screen: Displays channel number, battery level, and signal strength.
5. Setup
5.1 Battery Installation
- Align the battery with the back of the radio unit.
- Slide the battery upwards until it clicks securely into place.

Image 5.1: The KSUN P85 radio with its battery detached, illustrating the battery installation process.
5.2 Antenna Attachment
- Screw the antenna clockwise onto the connector at the top of the radio until it is finger-tight. Do not overtighten.
5.3 Charging the Battery
- Connect the AC charger adapter to the cradle charger.
- Place the radio (with battery installed) into the cradle charger.
- Ensure the charging indicator light on the cradle illuminates, indicating proper charging.
- Charge the battery fully before first use.
6. Operating Instructions
6.1 Power On/Off and Volume Adjustment
- To power on the radio, rotate the Switch/Volume Knob clockwise until you hear a click.
- Continue rotating the knob clockwise to increase the volume, and counter-clockwise to decrease it.
- To power off, rotate the Switch/Volume Knob counter-clockwise until you hear a click.
6.2 Channel Selection
- Rotate the Channel Selection Knob to choose your desired communication channel. The selected channel number will be displayed on the hidden screen.
6.3 Transmitting and Receiving
- To transmit, press and hold the PTT Key on the side of the radio. Speak clearly into the microphone.
- Release the PTT Key to stop transmitting and return to receive mode.
- When receiving a signal, the radio will automatically output audio through its speaker.

Image 6.1: The KSUN P85 radio displaying channel information and signal strength on its hidden screen during operation.
6.4 Voice Control (VOX)
The radio supports voice-activated transmission (VOX) for hands-free operation. Refer to the full user manual for detailed instructions on enabling and adjusting VOX sensitivity, typically through programmable function keys or software.
6.5 Programming Channels
The KSUN P85 comes pre-programmed with standard marine channels. For custom channel modifications or advanced settings, a K-head writing cable and specific software (not included) are required. Please contact KSUN customer service for software and support if custom programming is needed.
6.6 Product Overview Video
Video 6.2: A brief overview video showcasing the KSUN P85 radio's design, features, and IP68 waterproof capability.
7. Maintenance
7.1 Cleaning
Wipe the radio's exterior with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners. Ensure all ports and covers are securely closed before cleaning, especially if using water.
7.2 Battery Care
- Charge the battery regularly, even if the radio is not in frequent use, to maintain battery health.
- Avoid fully discharging the battery frequently.
- Store the battery in a cool, dry place when not in use for extended periods.
7.3 Waterproof Seal Inspection
Periodically inspect the rubber seals around the battery compartment and accessory jacks for any signs of wear or damage. A compromised seal can affect the IP68 waterproof rating.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Radio does not power on | Battery discharged or improperly installed. | Ensure battery is fully charged and correctly seated. |
| Cannot transmit or receive | Incorrect channel selected, out of range, or antenna not attached. | Verify channel, move closer to other radios, check antenna connection. |
| Poor audio quality | Volume too low, microphone/speaker obstructed, or weak signal. | Adjust volume, clear obstructions, ensure good signal strength. |
| Radio is not waterproof | Battery cover or accessory port covers not sealed properly. | Ensure all covers are tightly closed and seals are intact before exposure to water. |
9. Specifications

Image 9.1: Detailed specifications table for the KSUN P85 radio.
| Feature | Detail |
|---|---|
| Model Number | KSUN-P85 |
| Brand | KSUN |
| Color | Black |
| Number of Channels | 199 (16 pre-programmed marine channels) |
| Special Feature | Waterproof (IP68) |
| Frequency Range | 136-174 MHz |
| Talking Range Maximum | 2 Miles (approximate, varies by terrain) |
| Voltage | 3.7 Volts (DC) |
| Water Resistance Level | IP68 |
| Product Dimensions (D x W x H) | 4.3" x 1.2" x 2" (excluding antenna) |
| Number of Batteries | 1 Lithium Ion battery (included) |
| Battery Average Life | 5 days (typical use) |
| Tuner Type | VHF |
| Connectivity Protocol | VHF |

Image 9.2: Visual representation of the KSUN P85 radio's dimensions (11cm / 4.33inch height, 3.2cm / 1.25inch depth, 5.2cm / 2.04inch width).
10. Warranty and Support
KSUN offers a 1-year money-back or replacement policy for the P85 radio. If you encounter any issues with your walkie-talkie, please contact KSUN customer service via email. We are committed to providing excellent customer support and will assist you promptly.