Single TTL 3DRobotics 3DR Radio Telemetry Kit 433Mhz Module for Quadcopter Multirotor APM APM2.5 2.5.2(3DR Radio Telemetry, 433Mhz Module, 3DRobotics Radio Telemetry)

Descriptions:
Single TTL 3DRobotics 3DR Radio Telemetry Kit 433Mhz for APM APM2

Features:
The 3DR Radio telemetry system is designed as an open source Xbee replacement radio set, offering a lower price, longer range and superior performance to Xbee radios. It’s availabl in 433Mhz; and in the following configurations:  serial board (for the air) and USB (for the ground).
The radio is a 2-way half-duplex wireless communication system with a standard TTL UART interface, based on HopeRF's HM-TRP data link modules, and custom firmware that improves upon the modules' original features and performance.
The SiK firmware includes a bootloader that permits radio firmware upgrades over the serial interface, and radio firmware with configurable parameters. Firmware upgrades and configuration are fully supported in the APM Mission Planner. Configuration is also possible through AT commands.

3DR Telemetry Kit Specifications:
Very small size
Light weight (under 4 grams without antenna)
433-434.79MHz
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
Please note that it is up to you to make sure you are allowed to use these radio modules in your country.  These devices can be used as short range licence expemp devices the UK under ESTI EN300 220, please refer to Ofcom IR2030 document, page 17.  You will need to configure the device to comply with your countries regulations
Size: 12 * 4 * 1cm / 4.7 * 1.6 * 0.4in
Package weight: 60g / 2.4oz

Note:
Flight control board not included

Package list:
1 * 3DR Radio Telemetry Kit 433Mhz