Features: Support 2.4GHz/868/915MHz frequency, suitable for FPVs traverser in different region and scene. Open source design, strong flexibility, small size design, lightweight and easy installation in various drones and models. Strong performances receiver, providing stable signal reception and fast response. Compatibility with a variety of flight controlled system, easy to use with different brand and models of flight controllers. Strong interferences resistance ability to ensure stable and stable communication during flight. Specifications: Material: Printed Circuit Board Type: Onboards Antenna, 2.4G 40mm Antenna, 2.4G 70mm Antenna, 868/915MHz 40mm Antenna, 868/915MHz 70mm Small Antenna, 868/915MHz 70mm Big Antenna(optional) Receiver Size: about 10x13mm/0.39x0.51inch Voltage: 5V Protocal: CRSF Package Includes: 1x ELRS RX Open Source Receiver with Antenna Kit note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.