Features: This is the best 30A ESC for multirotor. This hardware, with SimonK firmware, provides the ideal solution for multi-rotor use with a 100% high-performance N-FET design. Highest accuracy with crystal oscillator (temperature will not affect PWM working range like other cheap ESC). No low voltage cut-off, because any cut-off in the multirotor = failure. No excessive temperature cut-off, because any cut-off in the multirotor = failure. Description:Very high refresh rates, no buffering of the input signal, resulting in more than 490Hz response rate. 16KHz motor frequency, providing the fastest motor response and quietest operation (no 8KHz squeal). Super-simple, reliable performance! Nothing to program beyond throttle range. Advanced technology and exquisite workmanship. Specifications:Main Color: RedMax cont.current: 30AMaximum Current: 40A (10s)Voltage: 2-3S lixxMaterial: Composite MaterialFor Vehicle Type: AircraftApplication: RC Vehicles & ToysBEC: 5V/3ARproduct Size: 60*25*8mm/2.4*1.0*0.3inPackage Included:4 x Simonk 30A Brushless ESCUweight(SimonK): Before you buy them, you should be familiar with the somewhat experimental nature of SimonK firmware. This software pushes the motor response to the limit, so there may be combinations of motors and props that won't work.