This dimming controller can connect multiple units in parallel. One switch can control dimming from 0% to 100%, allowing synchronization and individual lamp control. As this dimming controller is passive, no external voltage is required. The dimming voltage range is 0-10V, with no power wattage limit. The product has a compact design, strong compatibility, and provides flicker-free and smooth dimming performance. Dimmer switches are widely used with various lighting types, including grow lights, track lights, spotlights, downlights, ceiling lights, panel lights, wall washers, and other compatible lighting fixtures. Easy to wire: Brown wire connects to positive, blue wire connects to negative. Compatible with 0-10V or 1-10V dimming signal drivers. DO NOT connect directly to AC power. To synchronize multiple dimmers in series: Set all dimming controller switches in the group to the ON position. Adjust all 0-10V dimmer knobs to the maximum brightness level. Then, use any single dimmer in the group to adjust the brightness of all connected units simultaneously. Color: Black Material: ABS Package Contents: 1 x LED dimmer switch Note: Only the items listed above are included. Other accessories are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement allows an error of +/- 1-3 cm.