One Channel LED Dimmer 12VDC, 8A For single color 12V LED ... turn on the power; 2. Adopt rotary button, its function as follows:Rotate button to the right, brightness will be brighter, when ... it to the far right, the brightness is greatest.Rotate button to the left ,brightness will be darker, when you rotate ... to the far left, the light will be turned off. One Channel LED Dimmer