See u0026 Be Seen: Super-bright so that you can easily see at night | Switch between the 4 lighting modes of high/low brightness for static lighting or fast/slow speed for flashing lighting so that you can easily be seen at nightLong- Lasting,Rechargeable Durable Batteries: 650mAh battery | Lasts over 6 hours on a full charge.The lights also come equipped with auto cut off circuits to prevent overcharging | Batteries are rigorously tested before being put into the lights to ensure durabilityMilitary-Grade Ruggedness u0026 Water u0026 Dirt Proof: Built with the highest quality materials to ensure that these lights can withstand extremely rough use like surviving through multiple 12-foot drops and staying under muddy water for over 6 hours.Easy To Use Mounting System: No tools required | Mounts and unmounts within 2 seconds | Mounting strap is used to mount the bike light onto things that have thick surfaces like handle bar, seatpost, seat riser, etc. | Mounting clip is used to mount the bike light onto things that have thin surfaces like backpack, jacket, shoes, etc.