The F4 flight controller provides you with the fascinating flight performance with the latest RaceFlight firmware. Extremely compact, it allows you to make the full advantages of your racing drone. Apart from that, it supports various aircrafts, including multirotors, planes and etc.  Features STM32 F405 MCU, runs RaceFlight CC3D REVO firmware  16MB large flash memory MPU6000 SPI Bus SBUS / PPM input port ( pin header ) 6 PWM output ports ( pin header ) Ultra small, only 36 x 36mm Mounting hole spacing: 30.5 x 30.5mm