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 break the connection and restore it automatically.With an LED indicator and a rotary switch, convenient to use.Suitable for many electrical devices.It is a practical module for controlling DC motor speed.color:greenWith an LED indicator and a rotary switch, convenient to use.Material: PCBPower, Output: Max.2AInput voltage: DC1.8V,3V ,5V,6V,12VItem Size: 3 * 5.5 * 1cm / 1.2 * 2.2 * 0.4inItem Weight: 14g / 0.5ozPackage List:1 * PWM motor speed adjuster moduleNote: 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.