2 Sets PWM Motor Speed Controller DC Switch Regulator 1.8V - 12V for Fan Pump Feature:1. Intelligent Control: Through PWM control, the motor speed controller can adjust the input voltage to DC 1.8V, 3V, 5V, 6V, and 12V.2. Better Design: This ultra-low voltage DC drive regulator also has a potentiometer with function switch and a power-on indicator.3. Higher safety: The resettable fuse will automatically disconnect under high current, which it will recover after cooling.4. Practical Application: Allows for wide use on fans, aquarium oxygen pumps and other equipment, very stable and practical.5. Easy to Install: Equipped with compact size and light weight, the installation is very convenient to complete. Specification:Item Type: Motor Speed ControllerMaterial: PCBCompable Power Input Voltage: 1.8V 3V 5V 6V 12V Speed Switch: 1803BKM Maximum Output Power: 30W Maximum Continuous Output Current: 2A List Packing:2 x Motor Speed Controller2 x Speed Control Knob2 x Washer2 x NutNote:1. Connect this DC controller to a DC power source. Do not directly connect To household 220V AC power supply, otherwise it will be damaged;2. The power supply should not be greater than 12V;3. It is a maximum current regulator of 2A, it can not drive more than 0.5A continuous current, 775 motor or baby car motor.