With forward and reverse switch, potentiometer knob with switch, forward and reverse can be controlled by PLC. The forward and reverse switch can be replaced with a jog switch. The display tube and the module are connected by a cable. The cable may loosen and fall off during express delivery. need to insert it tightly by themselves. If you mind, don't take pictures. With 0- digital scale positioning. Make sure that the positive and negative connections are correct before powering on, and the wiring should not touch the heat sink, which may burn the circuit board. Note that this is not a power module, and the motor must be connected to adjust the speed. If the motor is not connected, the output of the multimeter not change, and it cannot be connected to AC. For brushed motors. Input voltage: DC 10-55V (equal to the rated voltage of the motor) Output voltage: linear under load Maximum current: 60A Continuous current: 40A Speed regulation type: current regulation Speed regulation mode: potentiometer (linear) Support motor: DC brush motor Forward rotation reverse: Support Speed range: 0 - Control frequency: 15KHz Wiring type: terminal Knob Specification: 100K (with switch) Wiring type: fence terminal block Product weight: 170g Note: Electric bicycles cannot be used, including electric bicycle motors. The input voltage must be divided into positive and negative can not input 220V household electricity. The input voltage should be equal to the rated voltage of the motor (within 10-55V). The digital display is the motor full speed percentage 0-100, not the actual speed of the motor. The input voltage must be divided into positive and negative. The input voltage should be equal to the rated voltage of the motor within 10-55VDC. Colour:Green and Silver and Black Material:PCB and plastic and metal Size:100MM x 76MM x 28MM