The Planet Bike Grateful Red USB Tail light has a dazzlingly bright 28 LED PB Power Array array and three modes and USB charging. For added safety it has a CPSC certified reflector in the lens to keep you visible when the light is off. Versatile mounting options allow you to attach it to your seat post or rear rack with the included brackets. Features: Provides 160 degrees of visibility Steady, Courtesy and attention-grabbing Superflash modes Run times: 5 hrs (steady - 20 lm), 9 hrs (Courtesy - 6-18 lm) and up to 30 hrs (Superflash- 20 lm) Highly visible even in daylight Specs: Lumens Rear20 Recharge TypeUSB