Features

Independent signal amplifier 1W

Same design, both modules can be used either on the groundstation or in the air

Both come with Micro USB TTL port

Equips with 3 kinds of cable for APM and Pixhawk(5P for Apm,6P for Pixhawk) OTGUse a small omnidirectional antenna up to several kilometers

Bidirectional amplifiers available for greater range

Open source firmware

Specification
CP2102 high quality USB to TTL chips

433 MHz

Receiver sensitivity to -140 dBm

Transmit power up to 30dBm (1000mW 9600 bps)

Transparent serial link

Air data rates up to 250kbps

MAVLink protocol framing and status reporting

Frequency hopping spread spectrum (FHSS)

Adaptive time division multiplexing (TDM)

Support for LBT and AFA

Configurable duty cycle

Built in error correcting code (can correct up to 25% data bit errors)

Demonstrated range of several kilometers with a small omni antenna

Can be used with a bi-directional amplifier for even more range

Open source firmware

AT commands for radio configuration

RT commands for remote radio configuration

Based on HM-TRP radio modules, with Si1000 8051 micro-controller

Very small size(L53mm W25mm H12mm)

Light weight (under 11 grams without antenna)