Skystars F7 + KO45 is an affordable stack for freestyle and racing drones. The flight controller with F7 processor has 8MB of memory for blackbox and 5V/3A and 10V/3A BEC. The FC also has a connector for connecting DJI FPV and OSD, so it can be conveniently used on drones with digital and analog video transmission. Pads for connecting LEDs in the corners of the unit are also nice. It is supplemented by a 45A controller with BlHeli_S firmware. The FC has integrated barometer for altitude measurement.