Dimension 50 x 25 x 8mm / 2.0 x 1.0 x 0.3in Others Max cont.current : 30A Peak current : 40A (10s) Voltage : 2-3S lipo BEC : 5V/3A Overview of 30A SimonK Firmware Brushless ESC with 3A 5V BEC Highest efficiency 100% N-FET design Highest accuracy with Crystal Oscillator (Temperature won't affect the PWM operating range like other cheap ESC's) Super high refresh rate, no buffering of the input signal, resulting in more than 490Hz response rate 16KHz motor frequency, giving fastest response of the motor, and quietest operation as well (no 8KHz squeal) Super simple, foolproof operation! Nothing to program other than the throttle range NOTE (SimonK) : Before you buy these, you should make yourself familiar with the somewhat experimental nature of the SimonK firmware. This software pushes the motor response to the limit, so there may be motor and prop combinations that won't work. Due to the lack of overcurrent/overheat/low voltage sensing , it's easier to destroy the ESC and possibly the motor too.