FlySky FRM303 2.4GHz 18CH AFHDS 3 Long Range Transmitter RF Module PPM/S.BUS Output for Flysky PL18 EL18 NB4/NB4 Pro Radio Controller Precise details: FRM303 is a multi-function high performance RF module in compliance with the AFHDS 3 third generation automatic frequency hopping digital system protocol. It features an external replaceable single antenna, support of bi-directional transmission, three power supply methods, support of voltage alarm function in case of external power supply, and support ofinputting PPM, S.BUS and UART signal. Description: Brand: FlySky ProductName: FRM303 Adaptive Devices: PPM: Devices that can output standard PPM signals, such as FS-TH9X, FS-ST8, FTR8B receiver. S.BUS: Devices that can output standard S.BUS signals, such as FS-ST8, FTr8B receiver; Closed Source Protocol-1.5M UART: PL18; Open Source Protocol-1.5M UART: EL18; Open source protocol-115200 UART: Devices that can output open source protocol-115200 UART signal . AdaptiveModels: Fixed-wing aircraft, racing drones, relays, etc. Number of Channels: 18 Resolution: 4096 RF: 2.4GHz ISM 2.4G Protocol: AFHDS 3 Maximum Power: 3500m (Air distance without interference) Antenna: External sigle SMA antenna（Outer-screw-inner-pin） Input Power:XT30 Interfac:5~28V/DC Signal Interface: 5~10V/DC USB Port: 4.5~5.5V/DC WorkingCurrent: 98mA/8.4V(External power supply) 138mA/5.8V (Internal power supply) 135mA/5V(USB) Data Interface: PPM, UART and S.BUS TemperatureRange: -10℃ ~ +60℃ HumidityRange: 20% ~ 95% Online Update: Yes Dimensions: 75*44*15.5mm(Excluding antenna） Weight: 65g(Excluding antenna and adapter） Certifications: CE, FCC ID:2A2UNFRM30300 Package Included: 1x FlySky FRM303 2.4GHz Transmitter RF Module