Description The item is a professional and practical 30A brushless ESC controller, which is compatible with all kinds of brushless motors, and features 30A continous ouput current. With easy to install and safe protection design, it is really a wonderful brushless ESC for choice. Features - Color: As shown in the pictures.- Material: Durable plastic and copper wire.- Size: about 45 * 24 * 11mm.- Output: Continuous 30A, Burst 40A up to 10 Secs.- Input Voltage: 2-3cells lithium battery or 5-9 cells NiCd/NIMh battery.- BEC: 1A / 5V (Linear mode).- Max Speed: 210,000rpm for 2 Poles BLM, 70,000rpm for 6 poles BLM, 35,000rpm for 12 poles BLM (BLM: BrushLess Motor).- Compatible with: 400-450 helicopters / Aircraft or Quad-Rotor Multi RC Helicopter.Packing list: 1 * 30A Brushless Controller ESC for Multicopter KK Quad-rotor X-copter