Equipped with an LED bulb, the Portable Battery Navigation Light uses 90% less energy than those with incandescent bulbs and is rated for 100,000 hrs. of service life. Molded one-piece construction features shock-resistant neoprene accents. Features a sealed heavy-duty ON/OFF switch and insert-molded brass threaded mounting bushings. Removable lamp carriage assembly. Operates on 4 AA batteries (not included). Different models vary in where and how they mount to your craft. Dimensions: 6.18" x 2.53".