Feature: 1. Smart 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 volt DC motor regulator also has potentiometer with switch function and power on indicator. 3. Higher Safety: The resettable fuse will automatically disconnect under high current, which will recover when cooling down. 4. Practical Use: Allows for wide application on fans, fish tank oxygen pumps and other devices, very stable and practical. 5. Easy to Install: Comes with a compact size and a light weight as well, the installation is very convenient to complete. Specification: Item Type: Motor Speed Controller Material: PCB Input Power Supply Voltage: 1.8V 3V 5V 6V 12V Speed Switch: 1803BK Maximum Output Power: 30W Maximum Continuous Output Current: 2A. Package List: 2 x Motor Speed Controller2 x Speed Control Knob2 x Washer2 x Nut Note: 1. Please connect this DC controller to a DC power source. Do not directly connect to the household 220V AC power supply, otherwise it will be damaged; 2. The power supply should not be greater than 12V; 3. This is a 2A maximum current governor, can not drive more than 0.5A continuous current, 775 motor or children car motor.