Niterider Sentinel 250 Tail Light The Niterider Sentinel 250 rear bike light allows you to be seen day or night by projecting a whopping 250 lumens of bright light. It is designed to increase cycling safety by way of 2 varying flash patterns and 2 steady beams (High/Group Ride Mode). Behind the durable red lens and casing are two powerful LEDs that emit 250 lumens in the brightest Daylight Visible Flash setting, allowing you to be seen day or night. For enhanced safety, the Laser Lane modes (3) are designed to project ultra-bright laser lines on the ground. This creates a virtual lane for the rider, further increasing visibility. Features Daylight Visible Flash allows you to be seen even in the daylight hours. Highly visible laser lights create a virtual bike lane USB rechargeable for convenient charging. Group ride mode be seen without distracting fellow cyclists. Flash Modes Mode1234567Run Time (h:min)6:305:008:0045:0011:3011:305:30Specifications Number of LEDs2Battery Type Rechargeable Weight116g Water Resistant Yes Low Power Indicator Yes Mounting Type Seatpost Battery Mounting Self contained | Niterider | Sentinel 250 Tail Light 250 Lumen