1: What are the components of this reciprocating mechanism? The reciprocating mechanism includes a geared motor, an adjustable speed power supply, and a reciprocating mechanism. The equipment is installed and shipped, and you can go back and in the 110V/220V household electricity to run. 2: Reciprocating mechanism stroke selection There are two types of reciprocating mechanism: 1: Stroke of 20MM~80MM (freely adjustable) 2: Stroke of 30MM ~ 150MM (freely adjustable) If you need a stroke of 30MM ~ 150MM you can contact to purchase. 3: The number of times of reciprocating expansion and contraction per minute The option marked in the option is the maximum speed of the motor with no load. For example: 24v240 rpm, which means: the fastest can be stretched 240 times per minute under this voltage. 12v45 rpm, which means: the fastest can be stretched 45 times per minute under this voltage. (Through the speed control power supply, you can arbitrarily adjust the speed you need within the maximum speed), Manufacturer: MJFVN