Wmicro 0Amp 30A Firmware Brushless ESC with 3A 5V UBEC for Quad Multi Copter APM2(Shipped From US) Gives you the perfect solution for multirotor use Highest efficiency 100% N-FET design. Highest accuracy with Crystal Oscillator (Temperature won't affect the PWM operating range like other cheap ESC's). No low voltage cutoff and No over temp cutoff, because any cutoff in a multirotor = crash. Super simple, foolproof operation! Nothing to program other than the throttle range.