This dimming controller supports connecting multiple lamps in parallel. One switch enables dimming from 0% to 100%, synchronized on/off control, and independent dimming and switching of individual lamps. The controller is passive and does not require external voltage. Operating dimming voltage is 0-10V with no power wattage limitation. Compact in size, it offers strong compatibility and provides flicker-free and jitter-free dimming performance. Suitable for use with various lighting applications including plant growth lights, track lights, spotlights, downlights, ceiling lights, panel lights, wall washers, and other 0-10V compatible fixtures. Easy wiring: connect brown wire to positive and blue wire to negative. Compatible with various 0/1-10V 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 ON, adjust all 0-10V dimmer knobs to maximum, then rotate any one knob in the group to control overall brightness synchronously. Color: Black. Material: ABS. Package includes: 1 x LED dimmer switch. No other items included. Note: Lighting and display differences may cause slight color variations between image and actual item. Measurement tolerance: +/- 1-3 cm.