SKY 20A 4-in-1 Brushless ESC Speed Controller with SBEC 2-6S for Quad-copter Multicopter DJI FPV Material: durable hard plastic and copper wire. Size: about 60*55*12mm. 20A 4-in-1 Brushless ESC Speed Controller with SBEC 2-6S. Suitable for Quad-copter Multicopter DJI FPV Output capacity: each ESC continuous current 20A, surge current 30A. Voltage input: 2-6S.