BW&reg; 4Pcs 30A Brushless Motor Speed Controller ESC BEC for RC Quadcopter Multi-copter Helicopter 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) No over temp cutoff, because any cutoff in a multirotor = crash. No low voltage cutoff, because any cutoff in a multirotor = crash.