Overview:This Holybro SiK Telemetry Radio is a small, light and inexpensive open source radio platform that typically allows ranges of better than 300m 'out of the box' (the range can be extended to several kilometres with the use of a patch antenna on the ground). This radio is plug-n-play all Pixhawk Standard and other Flight Controller, providing the easiest ways to setup a telemetry connection between your Autopilot and a ground station. It uses open source firmware which has been specially designed to work well with MAVLink packets and to be integrated with the Mission Planner, Ardupilot, QGroundControl, PX4 Autopilot. The radios can be either 915Mhz or 433Mhz and you should purchase the model which is appropriate for your country/region. Note:This new batch of SiK Telemetry Radio V3 does not support firmware upload via Mission Planner 1.3.75 or older. Please use Mission Planner 1.3.75.1 or newer if firmware upload is needed. QGroundControl does not support firmware upgrade for this new batch of SiK Telemetry Radio V3 at this moment. Features:1. Open-source SIK firmware2. Plug-n-play for Pixhawk Standard Flight Controllers3. Easiest way to connect your Autopilot and Ground Station4. Interchangeable air and ground radio5. Micro-USB port (Type-C Adapter Cable Included)6. 6-position JST-GH connector Specification:Brand Name: HolybroItem Name: SiK Telemetry Radio V3Power: 100 mW maximum output power (adjustable) -117 dBm receive sensitivityConnector: RP-SMA2-way full-duplex communication through adaptive TDM UART interfaceTransparent serial linkMAVLink protocol framingFrequency Hopping Spread Spectrum (FHSS) Configurable duty cycleError correction corrects up to 25% of bit errors Open-source SIK firmwareConfigurable through Mission Planner & APM PlannerFT230X is a USB to BASIC UART IC Dimensions: 28 x 53 x 10.7mm (without antenna) Electrical Data:Supply Voltage: 5V DC (from USB or JST-GH)Transmit Current: 100 mA at 20dBmReceive Current: 25 mASerial Interface: 3.3 V UART Quick Start Guide, Click Here Package Included:2x Radio modules with antennas 1x Micro-USB to USB-A cable 1x Micro-USB to Micro-USB OTG adapter cable 1x Micro USB to Type C Adapter1x JST-GH-6P to JST-GH-6P cable (for Pixhawk Standard FC)JST-GH-6P to Molex DF13 6P (for Pix32, Pixhawk 2.4.6, etc.)