FrSky XSR 2.4GHz 16CH ACCST Super Mini Receiver with S-Bus and CPPM Output + Plus Targethobby 3 IN1 Low Voltage Buzzer Alarm Smart Port enabled, realizing two-way full duplex transmission S-BUS output. CPPM output Lighter weight and physically smaller than X4R More number of channels: 1~16ch from SBUS channel,1~8ch from CPPM Channel FrSky XSR 2.4GHz 16CH ACCST Receiver w/ S-Bus & CPPM