This is NiteRider's Sentinel 250 tail light. The Sentinel 250 has 4 light modes (2 flashing, 2 steady) and 3 Laser Lane modes. The Sentinel 250 tail light also features Group Ride Mode for cyclists who want to stay visible to cars but not distract others in the pack. Features: 4 Light Modes 3 Laser Lane Modes Group Ride Mode Daylight Visible Flash (DVF) Run times: 5 hours (Pulse) 6.5 hours (Flash) 8 hours (High) 45 hours (Group Ride Mode) Laser Lane Modes: 11.5 hours (Flash) 11.5 hours (Quick Flash) 5 hours (Steady) Specifications: Brightness: 250 Lumens Battery Type: Rechargeable (Micro USB) Run Time: 5 - 45 Hours Beam Color: Red Color: Black Weight: 116g Includes: LED Tail Light w/ Laser Lanes Seat Post Mount USB Charging Cable