The LED dimmer is flush mount, its mounting hole size is 10mm/0.39 inch, it saves space can be easily attached to the LED light. This LED light dimmer switch is usually used as a DC12V switch can also be used as a 3.6V to 15V LED touch switch. Please make sure your driver is a constant voltage driver as this dimmer switch can only be connected to a constant voltage driver. This LED dimmer switch cannot be connected to a constant current driver. You can check the picture to underst the difference between constant voltage driver constant current driver. 12V DC LED dimmer: DC switch Input voltage: DC 3.6-15V; working current 2.5A, 12V dimmer switch intelligent control, just touch, touch again, press hold the dimmer switch to adjust the light brightness from 0% To , long press the touch light control module to steplessly dim control the light. 12V volt switch for RVs, cabinets, wine coolers, display cases, closets more. The 12 volt light switch is also used to control LED lights like , ceiling lights, pendant lights other smart devices, you can run the LED switch on other items. size: 10mm Material: ABS colour: White Package Contents: 2 x Led Touch Switch Only the above package content, other are not included. Note: Light 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.