Module features:1. With optocoupler isolation, the control signal and the power of the controlled device are isolated, which greatly increases the rigidity of the interference.2. Compatible with MCU and Arduino control board, 3V or 5V signal3. High level start, low level stop, PWM speed regulation4 .Widely used to control the start and stop of the motor, solenoid valve and other tributary equipment5. There are various specifications of MOS tube to provide choices,E.g:FR120N : 100V 9.4ALR7843 : 30V 161AAOD4184: 40V 50A6. The signal input side can be welded to the terminal or pin itself, compatible breadboard7. Output can be soldered to the terminal or direct wire8. Module size 23mm X 16mm There are two 2mm diameter screw holes, hole spacing 8mm