Dshot&reg; Single TTL 3DRobotics 3DR Radio Telemetry Kit 433Mhz Module 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. 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 Fully supported in the APM Mission Planner. Configuration is also possible through AT commands. Built in error correcting code (can correct up to 25% data bit errors)