The Lezyne Zecto Alert Drive Taillight is a futuristic LED bicycle light programmed with Lezyne's Alert technology and featuring a Daytime Flash mode that comes in a small package. Alert technology changes the pattern of the light based on deceleration and speed. When decelerating, the light becomes solid much like a vehicles brake lights. Once completely stopped, it then changes back to a flash pattern to help vehicles and other riders take notice. While riding, the Zecto Alert Drive Taillight will then resume its previous output mode. This model is crafted from a lightweight Composite Matrix making it extremely durable and the aluminum bezel adds great aesthetics. Utilizing Lezyne's patented 2-in-1 clip/strap system makes this an extremely versatile unit allowing it to mount to seat posts or clip onto a bag. With a max output of 80 lumens, five output modes, and a max runtime of up to 15 hours, the Zecto Alert Drive is an amazing option to safely ride at night and during the day. Features: 5 light modes: Blast (20 lumens), Economy (5 lumens), Day Flash (80 lumens), Flash 1 (200 lumens), Flash 2 (20 lumens) Time estimates: Blast (4.5hrs), Economy (15.5hrs), Day Flash (6.5hrs), Flash 1 (11.5hrs), Flash 2 (15.5hrs) Side indicator LEDs monitor battery power and provide added visibility Composite back cap features a secure clip or use the included silicon rubber strap to attach to a variety of tube diameters Includes micro USB cable for convenient recharging Specifications: Brightness: 80 Lumens Battery Type: Rechargeable (Micro USB) Run Time: 4.5 - 15.5 Hours Beam Color: Red Color: Black Weight: 53g