The 1203BB DC motor speed controller regulates the motor speed by adjusting the pulse width modulation (PWM). Operating voltage: DC 6-24V. Maximum continuous output current: 3A. Maximum output power: 80W. The motor speed controller built-in switch. You can control the forward or reverse direction and stop of the DC motor by the switch. The circuit built-in a 3A fuse. Make this motor safer to use. Note! The DC motor speed controller is connected to the DC power supply. Never connect directly to the household mains power supply.