The all-new Sentinel 150 Tail Bike Light is NiteRider's brightest model in the Sentinel series. With three (3) powerful LEDs projecting a retina searing 150 ultra-bright lumens, it's a lightweight portable package that raises the bar for self-contained LED bicycle tail lights.Daylight Visible Flash (DVF) Highly visible laser lanes Class leading ultra bright 150 lumen output All in one, Laser and tail light! Compatible with round and aero seat posts Convenient USB rechargeable Group Ride Mode ? be seen without distracting fellow cyclists Easy on and off seat post strap mount with quick release tab FL1 Standard IP64, water resistant Lumen Output: 150 Run Time: 4:00 ? 21:00 hrs Charge Time: 4:00 hrs Weight: 116g Battery: Li-Po LED Tail Light with Laser Lanes Seatpost Mount USB Cable Made in the USA for more than 25 years!