237037 Brand new and high quality Automatically find the center High-frequency drive system Overheat protection Low-voltage protection The use of low-resistance field-effect inner tube With forward and backward functions for car， boat Very reasonable price， buy one here Size: about 34 x 34 x 25 mm Input power: 4.8 - 8.4 V BEC voltage: 5.0 V PWM frequency: 1.5KHz Forward current: 320 A Backward current: 240 A 1 x ESC