Single Ttl 3drobotics 3dr Radio Telemetry Kit 915mhz Module For Apm Apm The product is shipped based on the color or size of the main image of the product page. Features: Very small size,light weight 915Mhz frequency band Transparent serial link Air data rates up to 250kbps Range of approx 1 mile with supplied antennas Demonstrated range of several kilometers with a small omni antenna Can be used with a bi-directional amplifier for even more range 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) Open source firmware AT commands for radio configuration RT commands for remote radio configuration Adaptive flow control when used with APM Based on the HopeRF HM-TRP radio module, featuring an SiLabs Si1000 RF microcontroller. Specifications: Item Name: 3DR Radio Telemetry Module Band: 915MHz Receiver sensitivity：-117 dBm Transmit power： up to 20dBm (100mW) Antenna connectors: RP-SMA connector Output Power: 100mW (20dBm), adjustable between 1-20dBm Sensitivity: -117dBm sensitivity Interface: Standard TTL UART Connection status: LED indicators FPV Radio telemetry air module size: 52 x 27 x 10mm FPV Radio telemetry ground module size: 70 x 25 x 11mm Package size: 165 x 80 x 11mm Package Included: 1 x Radio Telemetry base station (USB Connection) 1 x Telemetry Transceiver (Pin Header) 1 x lead set 2 x Antenna 2 x cable set