28 Key RGB LED Light String Dimmer RF Wireless Remote Controller Aluminum 12-24V Adopts advanced micro units control. Mainly used to adjust the brightness and color changing speed of RGB LED light source, such as point source of light, flexible light strip, wall washer lamp, glass curtain wall light and so on. 3 channels output. Total 28 modes for your choice. Matched with a Radio Frequency wireless remote control, ensures long remote distance.