The Superflash series taillights feature powerful LEDs providing constant and flashing modes for ultimate visibility.1/2 watt Blaze LED plus 2 eXtreme LEDs for visibility up to 1 mileUltra compact vertical design is weatherproof, lightweight and durableIncludes bike mounts and clip mount for multiple mounting optionsUp to 100 hours of run time on 2 AAA batteries (included)Constant and flashing modesAdditional purchase of LT7309 bracket will allow light to be mounted onto racks to provide a reflector mountSoft-touch power switch accesses2 Nichia LEDsBlaze 1/2W LEDItem SpecificationsWeight60gBattery2 AAABulb2 Red LEDRun Time100 Hours Constant/Flashing