Specification: This brand new 1803BK DC motor speed controller input supply voltage: 1.8V-15VDC; the maximum output power: 30W; the maximum continuous output current: 2A; working cycle adjustable: 0%-100%; size: 32x32x12 mm High quality material: this PWM motor speed controller is made of high quality PCB material, which has good durability and wear resistance to ensure a long service life. Input Voltage Range: This PWM speed controller for DC motors supports a wide input voltage from 1.8V to 12V DC At the same time, the output current is 0A-2A, which ensures a wide application. Safety protection: the controller is equipped with a fuse for self-restoration. If the power is too large, the fuse is automatically switched off. After cooling, the fuse is automatically restored again. Wide applications: It is suitable for the speed control of DC motors, fans, oxygen bottle pumps and other products in DC 1.8V - 12V. Specifications: Input supply voltage: 1.8V-15VDC. The maximum output power: 30 W. The maximum continuous output current: 2 A. Adjustable working cycle: 0% -100%. Size: approx. 32x32x14mm Please note: Please connect this DC controller to the DC supply. Never connect the device directly to a household 220V AC supply, otherwise it will be damaged. The power supply must not be higher than 12V, otherwise it will be damaged. This is a 2A high current regulator that cannot drive more than 0.5A continuous current / 775 motor / children's car motor. Please confirm again before purchasing. Box contents: 4 x PWM DC motor adjustable speed controller. 4 x buttons.