TOOGOO(R) MR.RC 12AMP 12A SimonK Firmware Brushless ESC w/2A 5V For QAV 250/300/F330 Multicopter Motor Speed Controller 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.