This dimming controller can connect multiple lamps in parallel. One switch can realize dimming in the range of 0~100%, synchronizing on and off, and dimming and switching of a single lamp. Because this dimming controller is passive, no external voltage is required. The dimming voltage is 0-10V, there is no power wattage limit, the product is small in size, the compatibility is strong, and the dimming process has no flicker and jitter. Dimmer switch are widely used in all kinds of plant growth lights, track lights, spotlights, downlights, ceiling lights, panel lights, wall washers and other lighting pairings Easy to wiring : Brown line connecting "+",Blue line connecting "-";Compatible with 0/1-10V dimming signal drivers ;DO NOT connect it with AC power directly. How to synchronize multiple dimmers in series : All dimming controller switches of the whole group are set to the ON position, all 0-10V dimmer knobs of the whole group are adjusted to the maximum value, and any 0-10V dimmer of the whole group can be rotated to adjust the dimming of the whole group of lamps synchronously. color: Black Material: ABS Package Contents: 4 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.