This 4 rotary knobs RGBW LED controller can be used to control up to 4 channels of RGBW or RGB LED tape lights, LED modules, or 12V DC - 24V DC constant voltage lights. The digital displays on top of each rotary knob lets you see the 0-255 dimming output levels of RGBW output levels. With all the features available on this controller you can create up to 4 trillion various color hues and fine tune to the LED colors desired. It has 37 built-in color-changing effects with brightness and speed controls by using the included wireless RF remote controller. Each of the 4 color RGBW can control up to 5 amps of LED lights, or 120 watts using 24V DC, 60 watts using 12V DC. Multiply it over the 4 channels and you can control up to 480 watts max at 24V DC or 240 watts max at 12V DC.