Potentiometer Amplifier With Switch RV12MM B50K

From the shop's description

Controls the speed of a DC motor by adjusting the pulse width modulation Suitable for low voltage and current. Over current protection with a 2 amp fuse — the fuse will blow if there is too much current and can reconnect automatically after the fuses cool The potentiometer has an external connection line, but without a switch Resistance Range : Up to 50K Ohm