Tera 4pcs 2-3S 30AMP 30A SimonK Firmware Brushless ESC W BEC Quad Multi copter APM NAZA 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, because any cutoff in a multirotor = crash. No over temp cutoff, because any cutoff in a multirotor = crash. Super high refresh rate, no buffering of the input signal, resulting in more than 490Hz response rate. Super simple, foolproof operation! Nothing to program other than the throttle range. 16KHz motor frequency, giving fastest response of the motor, and quietest operation as well (no 8KHz squeal). Max cont. current: 30A. Peak current: 40A (10s).