This 8 pack 0-10v dimmer knob for led lights is ONLY need to be connected the 0-10V / 1-10V Dimmable LED Driver. And it can be compatible with most of the LED drivers. The low voltage electronic pwm 0-10v dimmer is for the LED lights that have a separate dimmer circuit. It's specifically made to drive a PWM circuit built into the light. Dimmer adjustment range: 5-100%, stepless dimming and no flickering or humming. Small size: 0.9x1.3x1.3 inch (including knob height); Wire length: 13 inch. Easy to install. Brown line is "DIM +",Blue line is "DIM -". PLEASE NOTE: DO NOT connect it with AC power directly. Colour:black Material: ABS Package Contents: 8 x led dimmer switch Only the above package content, other products are not included. 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.