This dimming controller can join multiple lamps in parallel. One change can word dimming within the differ of 0~100%, synchronizing on and off, and self reliant dimming and switching of a unmarried lamp. Because this dimming controller is passive, no external voltage is required. The dimming voltage is 0-10V, there isn't any power wattage limit, the product is small in size, the compatibility is strong, and the dimming activity has no flicker and jitter. Dimmer swap are also used in all types of plant progress lights, tune lights, spotlights, downlights, ceiling lights, panel lights, wall washers and diversified lighting fixtures pairings! Easy to wiring : Brown line connecting "+",Blue line connecting "-";Compatible with assorted 0/1-10V dimming signal drivers ;DO NOT connect it with AC power directly. How to synchronize several dimmers in series : All dimming controller switches of the complete group are set to the ON position, all 0-10V dimmer knobs of the complete group are adjusted to the utmost value, and any 0-10V dimmer of the whole group could be turned around to adjust the dimming of the entire organization of lamps synchronously. color:Black Material:ABS Package Contents: 1 x led dimmer exchange Only the above equipment content, other merchandise should not included. Note: Light capturing and diverse reveals can cause the colour of the object in the photograph just a little diverse from the real thing. The size allowed error is +/- 1-3cm.