GENTOS Bike Light LED Bike Light, AA Battery Powered, 12 Lumens, Waterproof, Water Resistant BL-300BK/BL-300WH Road Bike Size: Body/40 x 89 x 70mm, Dedicated Bracket/14 x 45 x 57mm Body Weight: Body/105g (including batteries), Dedicated Bracket/22g Material/Material: Body/ABS (Acrylonitrile Butadiene Styrene) resin, Dedicated Bracket/POM (Polyoxymethylene (Polyacetal)) Batteries Used: 2 x AA alkaline batteries Set Contents/Accessories: Main unit, test batteries (AA alkaline batteries) x 2, dedicated bracket Brightness: 12 lumens Practical Lighting: Steady/40 hours, High-speed flashing/200 hours, Slow flashing/600 hours The premium economy model of the GENTOS bike light entry model "BL series". You can select from 3 modes: steady, high-speed flashing, and slow flashing. Equipped with a high-efficiency optical lens that concentrates the light distribution evenly and achieves a brightness of 550cd. With side emitters to appeal to your presence from the sides.