3DR Radio Telemetry 915Mhz Air and Ground Data Transmit Module for APM 2.8 PIX 

Feathers: 
915Mhz frequency channel transparent serial interface, data rate up to 250kbps, antenna range about 1 miles. 
Adaptive time-division multiplexing. 
Supports LBT and AFA, configurable duty cycle, built-in error correction codes (which can correct data errors up to 25%). 
Adaptive control of HopeRF HM-TRP radio AT radio module based on open-source firmware configuration command for RT command and APM radio remote configuration when used together with SiLabs, Si1000 RF micro controller. 

Specifications: 
Frequency channel: 915MHz 
Receiving sensitivity: -117dBm 
Transmitted power: Up to 20dBm(10 0mW) 
Antenna Connector: RP-SMA 
Connector output power: 100mW(20dBm) 
Sensitivity can be adjusted between 1-20dBm 
Sensitivity interface: Standard TTL UART 

Notes: 
Due to the light and screen setting difference, the color of the item may be slightly different from the pictures. 
Please allow slight dimension difference due to different manual measurement.