FrSky Taranis Compatible Receiver V8R4-II 4-channel 2.4ghz ACCST 1) Compatible with all FrSky modules (V8_mode & D_mode), receive only (V8R4-II can talk with module of either mode, but it does not send telemetry information back to the transmitter) 2) Wider and higher voltage range (V8R4-II: 3.0~16.0V, V8R4: 3.2~7.6V) 3) Longer specified range (V8R4-II: &gt;1km, V8R4: &gt;500m) 4) Dimensions: 36*17.5*8mm 5) Weight: 3.5g /2.7g (naked)