The USB Dimmer is a great way to easily dim your LED, Laser or EL Wire devices that are 5V DC. The touch dimmer uses PWM (Pulse Width Modulation) to dim these devices, with the touch of your finger. Simply press quickly to turn on or off. A longer press and hold allows your devices to dim, or press and hold again and it will increase brightness. Most EL and Laser devices have a minimum dimming of ~30% and a max brightness of 100% when using this dimmer.