The unit is vibration proof. It is not affected by engine vibration, so you can operate the light when cruising (and this is encouraged for a great “Wow Presentation!” They put out a beautiful display that is great for: Night Fishing (and attracting fish) · Night Swimming Diving · Lighting up your wake when underway · And for a great “Cool Factor” when sitting at your boat slip! We have used our high output LEDs to design and build a rock-solid drain plug light that installs in seconds with no cutting, drilling, or splicing. The unit doesn’t consume a lot of power but puts out a ton of light! Fits almost all ½” brass (Garboard type or similar) drains. Specs: Plug Light -Brass ½”NPT Garboard Style or Similar Cabling -5 Feet marine grade cable with Tinned Conductors Fuse -Inline fuse included Terminations -Alligator Clips