RadioMaster XR4 Receiver, Multi-Band ExpressLRS, 2.4GHz + 868/915MHz, Diversity

The RadioMaster XR4 Gemini Xrossband Receiver is a cutting-edge ExpressLRS receiver with True Diversity, operating simultaneously on 2.4 GHz and Sub-G 900 MHz. Powered by the Gemini Xrossband (Gem-X) protocol, it ensures exceptional link reliability in demanding environments.

Inside, dual Semtech LR1121 RF chips and an ESP32D4 MCU deliver high-speed processing with 500 Hz refresh rates (and up to 1000 Hz via future firmware). Its built-in Wi-Fi module allows seamless firmware updates and configuration via WebUI.

Weighing just 1.7 g (without antennas) and measuring 22×18×4 mm, the XR4 fits even the smallest FPV builds. The kit includes two dual-band T-antennas for enhanced reception on both bands.

Perfect for FPV pilots seeking maximum signal reliability, ultra-low latency, and effortless setup.

Key Specifications:

• Receiver: XR4 Gemini Xrossband Dual-Band ExpressLRS

• Frequency Bands: 2.4 GHz (2.404–2.479 GHz) + Sub-G 900 MHz (≈903–927 MHz)

• RF Chips: Semtech LR1121 × 2

• MCU: ESP32D4

• Telemetry Power: up to 100 mW

• Refresh Rate: 500 Hz (1000 Hz with future firmware)

• Min Rate: 50 Hz

• Input Voltage: 5.0–12.6 V

• Interfaces: CRSF + UART

• Antenna Connectors: IPEX-1 × 2

• Antennas: Dual-band T-antenna × 2

• Dimensions: 22 × 18 × 4 mm (20×20 mm mounting)

• Weight: 1.7 g (without antennas)

• Firmware: ExpressLRS v3.5.1 pre-installed

• Features: True Diversity, Wi-Fi WebUI, Gemini Xrossband (Gem-X), castellated pads