RadioMaster R81 2 4GHz 8CH Over 1KM SBUS Nano Receiver Compatible FrSky D8 Support Return RSSI for RC DroneDescription Brand Name RadioMasterItem Name R81 Nano ReceiverModel R81Weight 2gSize 17 11 mmChannels 8CHFrequency range 2400 2483 5MhzPower input range 4 5 6VSignal format FrSky D8 CompatibleOutput format SBUSSupport return support return RSSIControl distance more than 1kmAntenna length Approximaltly 6cmBind method 1 Press and hold the BIND button on the receiver then connect power After approximately 3 seconds the receiver LED will be RED the receiver is now in bind mode2 Select the D8 protocol for the multi protocol menu of your remote control and press the BIND option the red light of the receiver will flash indicating successful bind3 Exit bind mode on your remote control and disconnect power to the receiver then power the receiver once more The LED will now be solid RED indicated the bind is now done If not please repeat step 1 and 2Fail safe Protection 1 Press the BIND button once within 10 seconds of th eceiver being powered on and the receiver will save all the current channel values of the remote control as the fail safe value2 10 seconds after the receiver is powered on the BIND button function will be disabled to prevent accidental changes to to the fail safe settings while preparing the model for flightRSSI output This receiver has a total of 9 channels 8 channels an RSSI output channel Channels 1 8 are controlled by the remot