The Lezyne Strip Alert Drive STVZO Rear Light is an advanced LED rear bicycle light with Lezyne\'s custom programmed “Alert” technology, it features the STVZO certified Wide Angle Optics lens that provides up to 270° of visibility and an innovative automatic braking sensor. When decelerating, the cycle light will turn solid like a brake light and then provide a distinct flash pattern once stopped to alert riders or vehicles from behind. The bike light will then change back to its previous output mode once the rider resumes their ride.Its co-moulded construction is super compact, highly water-resistant and boasts 5 LEDs for up to 150 lumens of output. With 11 output modes, including a Daytime Flash mode, it’s got options for any time, day or night. A versatile mounting system attaches to aero or round seatposts and it’s micro-USB rechargeable. This is the ultimate rechargeable cycling taillight for the best possible visibility.Lezyne Strip Alert Drive STVZO Rear Light FeaturesCustom programmed Alert\" technology.STVZO certified Wide Angle Optics lens.Co-moulded construction.Highly water-resistant.Max. 150 lumens.11 Output modes.Daytime Flash mode.Micro USB charging.\"