Revolutionary bike lights that can help keep you safe on the road, road beam technology offers a uniform light pattern that illuminates a wide area in front of the light.They are also drop/shock resistant and highly water resistant, with an IPX4 rating. Large push buttons make it easy to use with gloves. And the required batteries are included, while the easy fix brackets and one touch removal system offers great convenience.The front light has two powerful white LEDs with an estimated 80 lumens and 15 hour runtime on high mode. There are two modes (On and Flashing). Side lighting is built into the design. The front light is powered by the included 4 x AA / LR6 batteries.The back light has one red LED and offers an estimated 50 lumens on high mode and is powered by the included 2 x AAA / LR03 batteries.Specifications Front light: 2 x white LEDs Light output: Est. 80 lumens on high mode Runtime: Est. 15 hours on high mode2 light modes to see and be seen for extreme safety on the road: all LEDs on/all LEDs flashingFront light Uses: 4 x AA batteries (included) Back light:1 x red LEDs Light output: Est. 50 lumens on high modeRear Light Uses: 2 x AAA batteries (included) Drop/shock resistant: Yes Water resistant rating: IPX4What's includedFront lightBack lightEasy fix mount brackets (use a philips screwdriver)(Rubber collars are included for smaller posts and handlebars and improved slip resistance) 4 x AA Energizer alkaline batteries 2 x AAA Energizer alkaline batteries