The Radiomaster XR4 Gemini Xrossband ExpressLRS Receiver offers cutting-edge dual-band reliability in an ultra-compact package. Supporting both 2.4GHz and Sub-G 900MHz frequencies via twin LR1121 RF chips, it ensures unmatched RF stability. Integrated with ExpressLRS v3.5.1 and true diversity, this receiver enables rapid data handling, boasting up to 1000Hz refresh rates. Ideal for drones and fixed-wing aircraft, the XR4’s lightweight 1.7g design and dual CRSF/UART bus interfaces make it an elite choice for demanding pilots. Enhanced with built-in Wi-Fi for easy configuration, it delivers precision and rock-solid performance wherever your flight takes you. Features: Dual Semtech LR1121 transceivers for enhanced range ExpressLRS Gemini & Gemini Xrossband (Gem-X) protocol Compact and ultra-lightweight for drones & wings ESP32D4 MCU with integrated Wi-Fi for WebUI access True diversity for stable RF links in tough conditions CRSF and UART interfaces for flexible setups Refresh rate up to 1000Hz with ultra-low latency Easy soldering with castellated pads Package Includes: 1 x XR4 Gemini Xrossband Dual-Band Receiver 2 x Dual-Band T-Antenna 1 x CRSF Wire 3 x Heat-Shrinkable Tube 1 x Manual Card Dual-band (2.4GHz & 900MHz) support Twin Semtech LR1121 RF chips Compact 22x18x4 mm and just 1.7g ExpressLRS v3.5.1 firmware pre-installed Dual bus interfaces: CRSF & UART True diversity with T-type dual-band antennas Specifications: Frequency (GHz): 2.4 Modulation Type: LoRa Color: Black Band-Range (GHz) 2.4G – 2.5 Bandwidth (KHz) 62.5 Charging Port (Y/N) N Code Type ExpressLRS Operating Voltage (VDC): 4.5V – 8.4V RF Power 100mW Item Type: XR4 Gemini Xrossband Dual-Band Receiver RF Chip R1121 x 2 RF connector IPEX-1 X 2 Frequency Range: 2.4GHz ISM Band Working Voltage DC 4.5 – 8.4V Weight 1.7g Camera Dimension(L*W*H)(mm) 22 18 4 Shipping Weight 0.017 kg Shipping Dimensions 20 × 8 × 2 cm
