Compatibility: 12 Volt dc dimmer switch used RV, Buses, Horse Trailer Conversions, Haulers, Travel Trailers, Boats etc. High-quality materials: The use of high-quality plastic composite materials, durable. Rounded edges do not scratch or scratch objects. Adjust the brightness: There are sliders on the side to adjust the brightness of the light. Suitable for LED, incandescent and halogen lamps. Multiple options: There are dimmer switches in white and black, which can be selected according to the color of your walls to make your walls look more beautiful. If you have any problems please kindly contact us by logging in your Amazon Buyer Account, Find your order and click Contact Seller we will respond you in one business day.