This motor speed controller allows the direction of a DC motor to be controlled using a pulse width modulated (PWM) . With a back-up fuse, it can automatically the connection and it automatically. With an LED indicator and a switch, convenient to use. Suitable for many electrical devices. It is a practical module for controlling DC motor speed. color:green With an LED indicator and a switch, convenient to use. Material: PCB Power, Output: Max.2A Input voltage: DC1.8V,3V ,5V,6V,12V Item Size: 3 * 5.5 * 1cm / 1.2 * 2.2 * 0.4in Item Weight: 14g / 0.5oz Package List: 1 * PWM motor speed adjuster module Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.