Hobbymate Brushless Speed Controller 40A W/ 3A BEC for Rc Helis, Rc Planes, Quadcopters Output: Continuous 40A, Burst 60A up to 10 Secs Input Voltage: Peak-40A: 2-6 cells lithium battery or 5-18 cells NiCd/NIMh battery. BEC: Peak-40A: 3A / 5V (Switch mode). Max Speed: 210,000rpm for 2 Poles BLM, 70,000rpm for 6 poles BLM, 35,000rpm for 12 poles BLM. (BLM: BrushLess Motor) ize: 55mm (L) * 28mm (W) * 12mm (H). Weight: Peak-40A: 35g.