RadioMaster XR4 Gemini Xrossband Dual-Band ExpressLRS ReceiverIntroducing 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.