Brushless 40A Speed ESC Controller 2-4S with 5V 3A UBEC for RC FPV Quadcopter RC Aircraft Helicopter 1. output capacity: continuous current 40A, short-term current 55A (no less than 10 seconds); 2. power input: 2-4 lithium batteries 3. BEC output: 5V at 3A (linear controller mode-linear mode); 4. maximum speed: 210,000 rpm for 2-pole engine, 7000 rpm/min for 6-pole engine and 35,000 rpm/min for 12-pole engine; 5. dimensions: 68mm (length) x25mm (width) x8mm (height); Color: As shown Material: plastic Package Contents: 1 x Brushless 40A Speed ESC Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.