FrSky D4R-II 4CH 2.4Ghz ACCST FPV Receiver (w/telemetry) FrSky D4R-II 4ch 2.4Ghz ACCST Receiver (w/telemetry) Compatible with FrSky two-way telemetry modules: DFT, DJT, DHT, DHT-U Lighter weight and physically smaller than D8R-II & D6FR Lighter weight and physically smaller than D8R-II & D6FR RSSI (PWM) and CPPM output