1. Introduction
The RadioMaster Boxer is a compact and ergonomic radio controller designed for precision control in RC applications. It features full-size Hall gimbals and an intuitive button layout, making it suitable for various pilots. This manual provides essential information for setting up, operating, and maintaining your Boxer radio controller.
Key Features:
- Available with built-in ExpressLRS or 4-in-1/CC2500 MPM RF modules.
- Powered by a robust STM32VGT6 processor with 1MB RAM.
- Compact design with excellent ergonomics, including new low-profile latching SE switch and momentary SF switch.
- Oversized battery compartment for a 2S 6200mAh pack, offering up to 20-hour duration (batteries not included).
- Equipped with full-sized V4.0 Hall effect gimbals as standard, with an option to upgrade to AG01 CNC Hall effect gimbals.
- Standard JR module compartment for external modules.
- RadioMaster standardized button layout for ease of use.
2. Safety Information
WARNING: Pay attention to polarity when installing cells as they can easily be reversed. Incorrect polarity will damage your radio.
Always ensure the antenna is properly installed before powering on the radio to prevent damage to the internal RF module.
3. Setup
3.1 Unboxing and Initial Inspection
Upon receiving your RadioMaster Boxer, carefully unbox all components and inspect for any signs of damage. The package typically includes the radio controller, a carrying case, and various accessories.
Image: The RadioMaster Boxer radio controller, its dedicated carrying case, and included accessories such as a USB cable and gimbal protectors.
3.2 Battery Installation
The Boxer radio controller requires a 7.4V 2-cell Lithium-Polymer battery or two 3.7V 18650 Lithium-Ion cells (batteries not included). Ensure correct polarity during installation to prevent damage.
Image: Rear view of the RadioMaster Boxer, highlighting the battery compartment. The compartment is designed to accommodate a 2S 6200mAh battery pack for extended use.
3.3 Antenna Installation
Before powering on the device, install the antenna securely. Failure to do so can result in damage to the internal RF module.
Image: A hand screwing the antenna into its designated port on the top of the RadioMaster Boxer radio controller. A warning label is visible, reminding users to install the antenna before powering on.
3.4 Powering On/Off
To power on the RadioMaster Boxer, press and hold the power button located centrally on the front panel until the display illuminates. To power off, press and hold the same button until the device shuts down.
Image: Front view of the RadioMaster Boxer radio controller, showcasing its Hall gimbals, monochrome LCD display, and control buttons.
4. Operating Instructions
4.1 Gimbal Control
The Boxer is equipped with high-precision V4.0 Hall gimbals for smooth and accurate control. These gimbals provide precise feedback for flight maneuvers.
Image: An angled front view of the RadioMaster Boxer, emphasizing the Hall gimbals and their ergonomic placement for comfortable operation.
4.2 Menu Navigation
The radio operates on EdgeTX firmware, offering an intuitive user interface. Use the scroll wheel and navigation buttons (SYS, RTN, PAGE, TELE) to access and configure settings on the 128x64 monochrome LCD display.
Image: An internal view of the RadioMaster Boxer's module bay, revealing the SD card slot for firmware updates and model storage.
4.3 External Module Usage
The Boxer features a standard JR module compartment, allowing compatibility with various external RF modules such as JR/FrSKY/Crossfire. This expands the radio's versatility for different protocols and receivers.
4.4 Firmware Updates
Firmware updates can be performed via USB/SD card and the EdgeTX Companion PC software. Regularly check the official RadioMaster website for the latest firmware versions to ensure optimal performance and access to new features.
5. Maintenance
- Keep the radio clean and free from dust and debris. Use a soft, dry cloth for cleaning.
- Store the radio in its carrying case when not in use to protect it from physical damage.
- Avoid exposing the radio to extreme temperatures or direct sunlight for prolonged periods.
- Ensure batteries are charged correctly and stored safely when not in use.
6. Troubleshooting
6.1 Radio Not Powering On
- Check battery installation for correct polarity.
- Ensure batteries are fully charged.
- Verify that the power button is pressed and held for the required duration.
6.2 No Signal/Binding Issues
- Confirm the antenna is securely attached.
- Ensure the internal or external RF module is correctly installed and configured.
- Verify that the receiver is compatible with the selected RF protocol and is in binding mode.
- Check for any obstructions or interference in the operating environment.
7. Specifications
| Feature | Detail |
|---|---|
| Item | BOXER |
| Radio Size | 235*178*77mm (9.3 x 7 x 3 inches) |
| Weight | 532.5g (1.17 pounds) |
| Frequency | 2.400GHz-2.480GHz |
| Internal RF Options | CC2500 multi-protocol / 4-in-1 multi-protocol / ELRS 2.4GHz |
| Supported Protocols | Module dependent |
| Transmitting Power (CC2500 and 4IN1) | Max 20dBm |
| Transmitting Power (ExpressLRS) | Max 30dBm (international) / Max 20dBm (EU LBT) |
| Cooling Fan | Built-in (ELRS version) |
| Voltage Range | 6.6-8.4V DC |
| Radio Firmware | EdgeTX (Transmitter) / Multi-Module (RF module) / ELRS |
| Channels | Max 16 channels (Receiver dependent) |
| Battery | 7.4V 2-cell Lithium-Polymer / Two 3.7V 18650 Lithium-Ion cells (batteries not included) |
| Display | 128*64 Monochrome LCD display |
| Gimbal | High precision 4.0 Hall gimbals as standard (AG01 Optional) |
| External Module | JR/FrSKY/Crossfire compatible |
| Upgrade Method | USB/SD card & EdgeTX Companion PC software |
| Manufacturer | RadioMaster |
| Model Number | HP157-BOXER-M2 |
| Date First Available | February 1, 2023 |
8. Official Product Videos
RadioMaster Boxer M2 ELRS Portable RC Transmitter Overview
Video: An official overview of the RadioMaster Boxer M2 ELRS Portable RC Transmitter, showcasing its design, features, and capabilities in action. This video highlights the transparent version of the controller.
9. Warranty and Support
For warranty information, technical support, and further assistance, please refer to the official RadioMaster website or contact your authorized dealer. Keep your purchase receipt as proof of purchase for warranty claims.





