The TandemLED 2-Button Tunable White Wired Dimmer/Temperature Controller was designed to easily control the brightness or temperature of tunable white lighting. Simply press the CCT or Tune button to cycle through temperatures, and press and hold to fade through the full range of 2700K-5000K. Press the Dim button to cycle through temperatures, and press and hold to fade from 1-100% brightness. Extremely easy installation uses the industry standard of two wires.UL Recognized to keep inspectors satisfiedRetain 0-100 percent brightness control no matter the Kelvin temperatureTunable white made easy - connect with only two wires