Ⅰ. Low Voltage Passive PWM Dimming Control: This LED dimmer switch is designed with low voltage passive PWM dimming control for 0-10V or 1-10V dimmable LED lights and fixtures. Ⅱ. DC 0/1-10V Knob LED Dimmer Switch: The DC 0/1-10V knob LED dimmer switch is suitable for controlling a wide range of dimmable LED lights and fixtures. Ⅲ. Easy to Install: This LED dimmer switch is easy to install and use, and can be connected to the existing lighting system. The dimmer knob can be widely used in downlights, track lights, wall washers, grow lights, electronic LED drivers, electronic ballasts, etc. It is compatible with most LED drivers. Ⅳ. Compact Design: The dimmer switch has a compact design, which makes it easy to fit into any space. Ⅴ. color:Black Ⅵ. Material:plastic Ⅶ. Package Contents: 3 x led dimmer switch / 1 x led dimmer switch Only the above package content, other products are not included. Ⅷ. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.