Technical Specification5 LED Bike Head Light: Length: 9.0cm Diameter: 3.5cm Weight: 40g Powered by 4 x "AAA" batteries (not included)5 LED Bike Safety tail light: Powered by 2 x "AAA" batteries (not included)Use: Outdoor sports like Bicycling, Climbing, Camping, hiking... Usually at home can also be used to read books, repair, to prevent power failures and so on, one more complexWhat"s in the box:1 x 5 LEd Bike Head Light 1 x 5 LEd Bike Safety TaillightThese Weatherproof Ultra Bright 5 LED Light set is perfect for low visability or the Dark or bad wether. Visable to both Pedestrians & Cars the Light Set will reduce the chance of accidents & keep you safe on the road. Rain Resistant Only.NOT FOR DIVING