Have one LED strip dimmer switch controller adapter. Color is black. Suitable for LED strip light, LED ribbon, LED rope light, such as COB LED strip lights, SMD 5050/ 3528/ 2835/ 5630 LED tape lights, aquarium lighting, etc. Use to adjust the brightness 0% - 100% dimming, no flickers at low brightness, stepless smooth dimming. Knob-operated control. Just rotate the knob to adjust the brightness or simply turn on/off the lights. Plug and play standard 5.5mm x 2.1mm DC barrel jack male/female connectors, no cutting and soldering required. Working voltage: DC 12V-24V. Working current: 3A Max. New in package.