Skystars F405 HD is a flight controller for freestyle drones. The board is equipped with an F405 processor, a gyro ICM42688, 16MB blackbox memory, 5V/3A and 10V/2A BECs for powering peripherals, and a barometer for altitude measurement. The unit also has a connector for connecting digital video systems and a chip for analog OSD. Practical pads for connecting LED diodes in the corners of the unit are also included.
You can find the wiring diagram here.