Just enter the square wave signal terminal a 50Hz signal， and then controls the duration of the high-level pulse signal cycle can control the speed and reversing and stalling. A high level pulse corresponds to the duration of a speed. HIGH 1 ms - 1.5 ms， Steering gear forward (1 msec fastest forward， closer to 1.5 milliseconds slower， 1.5 ms Steering gear stalled)， the high level of 1.5 ms to 2 ms when the Steering gear reverse (1.5 ms Steering gear stalling， the closer the faster reverse speed 2 ms， 2 ms fastest reversal)
Dimensions: 1.61 in x 0.79 in x 1.56 in (4.1 cm x 2.0 cm x 4.0 cm) Weight: 2.47 oz (70 g)