Extremely powerful taillight with StVZO optimized lens and two ultra bright LEDs providing class-leading brightness. Lightweight, durable construction is IPX7 waterproof rated. Wide Angle Lens for up to 270° of visibility. Three output modes offering up to 36 lumens of output. Micro-USB rechargeable for up to 13 hours of runtime. New compact design is more versatile and can mount to round or aero style seatposts.Features:Max Lumens: 36 ,Weight: 53g ,Max Runtime: 13 hours ,Recharge Time: 2 hours.