Skystars F4 + KO45 is an affordable stack for freestyle and racing copters. The control unit with F4 processor uses a reliable gyro MPU6000, has 8MB of memory for blackbox and 5V / 3A and 10V / 2A BEC. The unit also has a connector for connecting DJI FPV and OSD, so it can be conveniently used on copters with digital or analog video transmission. The pads for connecting LEDs in the corners of the unit are also nice. It is supplemented by a 45A controller with BlHeli_S firmware. Diagram Key Features Power supply: 3-6S Processor: STM32F405 Blackbox: 16MB Barometer BEC: 5V @ 3A, 10V @ 2A Connector for DJI FPV Mounting holes: 30.5x30.5mm M3 (with softmount) Current sensor ESC FW: BlHeli_S Package Includes 1x Control unit 1x ESC 1x Accessory set