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Specifications - Very small size - Light weight (under 4 grams without antenna) - Receiver sensitivity to -121 dBm - Transmit power up to 20dBm (100mW) - 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 - Adaptive flow control when used with APM - Based on HM-TRP radio modules, with Si1000 8051 micro-controller and Si4432 radio module Support OTG of Android Cellphones, and computer OTG. Antenna is 5.8G Package includes: 1x Air Module(915Mhz) 1x Ground Module(915Mhz) 1x 4Pin-5pin cable 150mm for APM 1x 4Pin-6pin cable 150mm for Pixhawk 2x 5.8G Antenna 1x USB cable