The Fenix BC05R V2.0 is a rechargeable bike taillight built to keep cyclists safe. Be seen in traffic with its maximum 15 lumens of red signaling light. Six modes include different speeds of flash as well as different brightness levels so you can choose which mode best suits the current conditions. The built-in 400mAh Li-polymer battery delivers a maximum 120 hours of runtime (in low fast flash mode), which will last two months on a single charge if you commute 2 hours a day. Quickly charge the taillight via the Type-C interface. With the included body clip, you can attach the Fenix BC05R V2.0 Rechargeable Bike Taillight to your helmet, pocket or backpack. Rated IP66 rain proof and dustproof, this bike taillight will help make your bicycle commute much safer.