Note: 1.Factory compatible with conventional power, stable operation, safety, and not easily damaged 2. 7 kinds of motor gears of different specifications are presented, please choose the same gear as the original motor gear. 3. There are 2 motors and 7 different gears in one box. 4.Free 2 cables for your convenience. 5.When you decide which tooth to use, you can use a hammer to attach the tooth to the motor, just as the picture describes.