Features: 27.5 * 27.5mm, mini size with light weight. 8CH receiver compatible with Frsky, with serial output. High discharge battery connector wire for more power and performance. Built-in DC-DC boost circuits, can be powered by other devices via IIC and UART ports. Driver motor frequency is 2K (set by users, max 32K). Players can use CleanFlight to set parameters by the USB port.