Hobbypower Emax BLHeli 12A ESC Speed Controller for Mini FPV QAV210 QAV250 Quadcopter Drone With low voltage, overheat protection and self detection function Parameter adjustable by programer or remote controller Throttle stroke adjustable, compatible with different receivers. Built-in linear BEC Suitable for mini FPV drone QAV180/QAV210/QAV250/QAV270/QAV280 quadcopter