The Lezyne Strip 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 Strip Alert Drive Taillight will then resume its previous output mode. This micro-USB rechargeable model utilizes a versatile mounting system that is compatible with both aero or round posts. With a max output of 175 lumens, five output modes, and a max runtime of up to 27 hours, the Strip Alert Drive is an amazing option to safely ride at night and during the day. Features: 5 light modes: Blast (35 lumens), Economy (3 lumens), Day Flash (150 lumens), Flash 1 (25 lumens), Flash 2 (25 lumens) Time estimates: Blast (4hrs), Economy (27hrs), Day Flash (5.5hrs), Flash 1 (8.5hrs), Flash 2 (10.5hrs) Side indicator LEDs monitor battery power and provide added visibility Attaches to aero or round posts Includes micro USB cable for convenient recharging Specifications: Brightness: 175 Lumens Battery Type: Rechargeable (Micro USB) Run Time: 27 Hours (Max) Beam Color: Red Color: Black Weight: 66g