1. Introduction
This manual provides essential instructions for the safe and effective use of your RADIOMASTER Boxer ELRS 2.4GHz M2 Radio Transmitter. Please read this manual thoroughly before operating the device to ensure proper setup, operation, and maintenance. Retain this manual for future reference.
2. Product Overview
The RADIOMASTER Boxer is a compact and ergonomic radio transmitter designed for precise control of remote-controlled vehicles. It features a transparent case with customizable LED gimbals and utilizes ExpressLRS 2.4GHz technology for high-speed, low-latency communication. The device comes pre-installed with EdgeTX firmware, offering intuitive and customizable flight control.
Key Features:
- Transparent Design: Features a transparent casing with a bonus white LED kit for customizable gimbals.
- ExpressLRS 2.4GHz: Provides high-speed, low-latency communication with receivers, supporting up to 30dBm (1W) maximum power.
- EdgeTX Firmware: Pre-installed for intuitive and customizable flight control.
- Compact & Ergonomic: Designed for portability with full-size hall gimbals for precise control and a comfortable grip.
- Extended Battery Life: Powered by a 2S 6500mAh battery for prolonged operation.
Component Identification:
Familiarize yourself with the various components of your Boxer transmitter.

Figure 2.1: Front View of Transmitter. This image displays the front of the RADIOMASTER Boxer transmitter, highlighting its transparent design, dual gimbals, various control switches, and the central color display screen.

Figure 2.2: Rear View of Transmitter. The rear view shows the battery compartment access and the ergonomic grip design, with the RADIOMASTER brand strap visible at the top.

Figure 2.3: Side View of Transmitter. This image illustrates the side profile of the transmitter, detailing the contours of the grip and the placement of side-mounted switches.

Figure 2.4: Top View of Transmitter. The top view highlights the antenna, USB connectivity port, and additional control knobs and switches located on the upper surface of the transmitter.

Figure 2.5: Package Contents. This image displays all items included in the RADIOMASTER Boxer package, such as the transmitter, a protective carrying case, USB cable, and various accessories like gimbal protectors and stickers.
3. Setup
3.1 Battery Installation
- Locate the battery compartment on the rear of the transmitter (refer to Figure 2.2).
- Open the battery compartment cover.
- Insert the 2S 6500mAh battery, ensuring correct polarity.
- Securely close the battery compartment cover.
3.2 Initial Power-On
- Ensure the battery is correctly installed.
- Press and hold the power button until the screen illuminates.
- The transmitter will boot into the EdgeTX firmware. Follow any on-screen prompts for initial setup, such as language selection and calibration.
3.3 Binding with Receiver
The RADIOMASTER Boxer uses ExpressLRS 2.4GHz for communication. The binding process typically involves placing both the transmitter and receiver into bind mode. Refer to your receiver's specific manual for detailed binding instructions.
- Power on the transmitter.
- Navigate to the ExpressLRS menu within EdgeTX.
- Select the 'Bind' option.
- Power on your receiver while it is in bind mode (usually indicated by a flashing LED).
- Once bound, the receiver's LED will typically become solid, and the transmitter will confirm the connection.
4. Operating Instructions
4.1 Basic Controls
- Gimbals: Control the primary flight surfaces (e.g., aileron, elevator, rudder, throttle).
- Switches: Used for various functions such as arming, flight modes, and special features. Refer to your model's setup for specific assignments.
- Knobs: Provide proportional control for auxiliary channels.
- Display Screen: Shows telemetry data, model settings, and menu navigation.
4.2 EdgeTX Firmware Navigation
The EdgeTX firmware provides a comprehensive interface for configuring your transmitter and models. Navigation is typically done using the scroll wheel and menu buttons.
- Main Screen: Displays real-time telemetry, battery status, and active model.
- Model Select: Access and switch between different model profiles.
- Model Setup: Configure settings specific to the selected model, including mixes, inputs, and outputs.
- Radio Setup: Adjust global transmitter settings, such as sound, backlight, and hardware calibration.
- ExpressLRS Menu: Manage ExpressLRS module settings, including power output and binding.
For detailed information on EdgeTX features and advanced configurations, please refer to the official EdgeTX documentation available online.
5. Maintenance
5.1 Cleaning
- Use a soft, dry cloth to clean the exterior of the transmitter.
- Avoid using harsh chemicals or abrasive materials, as these can damage the transparent casing and electronic components.
- For stubborn dirt, a slightly damp cloth with mild soap can be used, followed by immediate drying.
5.2 Storage
- Store the transmitter in a cool, dry place, away from direct sunlight and extreme temperatures.
- If storing for extended periods, remove the battery to prevent discharge or potential damage.
- Use the provided carrying case (refer to Figure 2.5) for protection during transport and storage.
5.3 Firmware Updates
Periodically check the official RADIOMASTER and EdgeTX websites for firmware updates. Keeping your firmware updated ensures optimal performance, new features, and bug fixes. Follow the instructions provided with the firmware update package carefully.
6. Troubleshooting
This section addresses common issues you might encounter with your RADIOMASTER Boxer transmitter.
| Problem | Possible Cause | Solution |
|---|---|---|
| Transmitter does not power on. | Low or depleted battery; incorrect battery installation. | Charge the battery; ensure battery is correctly installed with proper polarity. |
| No connection to receiver. | Not bound; receiver powered off; out of range; incorrect model selected. | Perform binding procedure; ensure receiver is powered and within range; verify correct model is selected on transmitter. |
| Gimbals or switches unresponsive. | Calibration issue; physical damage; incorrect model settings. | Recalibrate gimbals in EdgeTX settings; inspect for physical damage; check model settings for correct assignments. |
| Screen is blank or frozen. | Firmware issue; system crash. | Attempt a hard reset (power off and on); if persistent, consider reflashing firmware. |
If you encounter issues not listed here or require further assistance, please contact RADIOMASTER customer support or consult online communities for EdgeTX and ExpressLRS.
7. Specifications
| Feature | Detail |
|---|---|
| Brand | RADIOMASTER |
| Model | Boxer M2 |
| Item Weight | 2.61 pounds (approximately 1.18 kg) |
| Connectivity Technology | USB |
| Power Source | Battery Powered (2S 6500mAh recommended) |
| Radio Bands Supported | 2.4GHz (ExpressLRS) |
| Frequency | 2400 MHz |
| Special Feature | Transparent Design with Customizable LEDs, ExpressLRS 2.4GHz Technology |
| Firmware | EdgeTX |
| UPC | 724376352241 |
8. Warranty and Support
For warranty information and technical support, please refer to the official RADIOMASTER website or contact your authorized dealer. Keep your proof of purchase for warranty claims.
Online resources for EdgeTX firmware and ExpressLRS protocol are also available and highly recommended for advanced users and troubleshooting.





