HummingBird V4 AIO Flight Controller ExpressLRS(ELRS)2.4g with 25-400mw VTX Notice: This product is a replacement part specifically designed for the Hummingbird V4 BNF drone. It is not intended for any DIY projects. Utilizing this product in DIY activities, including but not limited to integration with non-NewBeeDrone brand frames/motors or any soldering processes, will void the NewBeeDrone warranty. Any inadvertent damage to the flight controller resulting from such DIY activities will not be covered, and all associated costs will be the responsibility of the user. Specification: MCU: STM32F411GYRO：BMI270VTX: 25mw for Racing/ 100mw and up to 400mw SmartMax temperature control with BeeTX 5.8Ghz AntennaESC: 12A BLHeliS pre-flashed with Bluejay 0.19.2 Target: O-H-10 48kHzESC Connector: JST-1.0 3PinOSD: NBD7456 Graphical OSD compatible with Betaflight OSDReceiver: 2.4G Antenna with MHF3 connectorFlight Controller Weight: 4.57g(Include antennas and battery connector) Flight Controller Size: Outer dimensions: 29x29x7.6mmFlight Controller Holes: 25.5x25.5mmBattery input: 1S OnlyUart1: freeUart2: freePower Plug: NewBeeDrone NX69 Connector SPI ELRS3.x receiver (Binding instruction: power on the drone, push the bind button under the flight controller to get into bind mode. If your remote control is not ELRS3.x or above version. You will need to update your remote controller ELRS to 3.x version because betaflight 4.5 will no longer support any lower version of 3.0)Please read through the SPI base information if you have difficulty with binding Firmware - Link