Introducing the XR4 XrossBand Receiver - The Pinnacle of compact Dual-Band Performance
The XR4 Receiver is a cutting-edge true diversity dual-band receiver featuring dual LR1121 RF transceivers, designed to leverage the advanced ExpressLRS Gemini Xrossband protocol (Gem-X). It seamlessly supports both the 2.4GHz and Sub-G 900MHz bands, and its dual T-type antennas provide superior reception sensitivity and connection stability for optimal performance.
Built with two independent RF circuits, the XR4 offers versatile operation modes, allowing you to switch between Gemini single-frequency or Xrossband dual-band modes, and can be tailored to your specific needs. The integrated Wi-Fi module simplifies firmware updates and configuration via a user-friendly WebUI on your PC or mobile device.
With ultra-low latency and a high refresh rate, the XR4 excels in delivering a stable, rock-solid RF link, even in demanding long-range or challenging environments. Its compact, lightweight design is perfect for drones, and fixed-wing models, offering reliable connectivity in critical situations where every signal matters. The XR4 ensures you maintain the most secure and robust RF link available, providing unbeatable reliability in the most demanding conditions.

Features
- True Diversity & Dual-Band
- Unmatched reliability with ExpressLRS Gemini Xrossband
- Compatible with ExpressLRS 2.4GHz, Sub-G 900MHz, Gemini & Gemini Xrossband (Gem-X)
- ESP32D4 high-performance MCU
- Twin Semtech LR1121 Transceiver
- Secondary UART port for advanced functionality
- Castled pads for easy soldering
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







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

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ShenZhen ZeMei Technology Co., Ltd is a well-know drone accessories and IC parts supplier in the many countries, now our team decide to more focus on uav/drone accessories.
We mainly provide drone motors, drone remote controller, drone propellers, magricultural drones, FPV racing drones, VTOL industrial drones with vertical takeoff and landing capabilities, agricultural fixed- wing drones, and other drone accessories.
We have already built a long-term cooperative relationship with well-know drone factory in China, and also we have many well-known domestic enterprises which establish stable trade relations and cooperation.
We sincerely hope to establish strong business relationships with yours and creat a win-win cooperation around the world.
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1.What is your minimum order and payment method?
We can accept sample orders for trial orders. T/T, Alipay and other regular payment tools can be acceptable.
2. ls there a warranty?
Of course. all our products have a 12-month warranty period. we provide 24-hour after-sales service
and technical support. if you find any problems during installation, please feel free to contact us.
3. What certificates are approved for your product?
We have CE, FCC, ISO 9001 and so on.
4. Can you customize it according to my needs?
You can send me inquiries according to your needs. we can customize them with technical engineers.
5. ls your price the lowest? Do you mind the quality?
The quality of our supply is value for money, inferior products will waste and affect the work process, why not choose a medium price to work well?
6. ls the product 100% assembled?
Yes, all the products are 100% assembled.
7. After-sales service
- all products are subject to strict factory quality inspection before packaging.
- all the products are packed in our factory, and the second package is delivered by express delivery before shipment.
- if there are any problems during operation or installation, please contact us freely and we will solve them with professional guidance.
8. Thank you for your trust and cooperation!