XR4 XrossBand Receiver – Dual-Band Performance in a Compact Design

The XR4 Receiver is a true-diversity dual-band ExpressLRS receiver equipped with two independent Semtech LR1121 RF transceivers. Designed to support the advanced ExpressLRS Gemini Xrossband (Gem-X) protocol, it operates across both 2.4GHz and Sub-G 900MHz bands for enhanced link reliability.

With dual T-type antennas and independent RF circuits, the XR4 provides excellent reception sensitivity and connection stability. It supports multiple operating modes, allowing you to choose between Gemini single-band operation or Xrossband dual-band mode according to your setup and application.

Built-in Wi-Fi makes receiver configuration and firmware updates simple. Access the intuitive WebUI from a PC or mobile device without the need for additional hardware.

With low latency, high refresh rates, and robust RF performance, the XR4 is designed to maintain a stable connection even in challenging environments with significant interference. Its compact and lightweight design makes it an excellent choice when reliable signal performance is critical.

Specification

• Item: XR4 Gemini Xrossband Dual-Band Receiver
• MCU: ESP32D4
• RF Chip: LR1121 x 2
• RF connector:  IPEX-1 X 2
• Antenna: Dual-Band T Antenna x 2 (Included)
• Frequency Range: 2.4GHz / Sub-G 900MHz
• Telemetry Power: 100mw
• Maximum receive refresh rate: DK500Hz / K1000Hz
• Minimum receiver refresh rate: 50Hz
• Working voltage: DC 4.5 - 8.4V
• Weight: 1.7g (without antenna)
• Dimension: 22mm * 18mm * 4mm
• Firmware Version: ExpressLRS v3.5.1 pre-installed
• FW Target: RadioMaster XR4 2.4/900 Gemini RX
• Bus interface 1: CRSF
• Bus interface 2: UART

Includes

• 1 * XR4 Gemini Xrossband Dual-Band Receiver
• 2 * Dual-Band T-Antenna
• 1 * CRSF Wire
• 3 * Heat-Shrinkable Tube
• 1 * Manual Card