Small and compact, this 180-lumen NiteRider taillight emits easy-to-see flash patterns. Brake Sensing tech alerts all behind you-drivers, cyclists and pedestrians-when you&';re slowing down. Features Chip-on-Board (COB) LEDs emit highly visible flash patterns in a smaller, more compact package Lightweight and easy to clip onto straps or belt loops while you ride. Brake Sensing Technology flashes light rapidly for 4-5 sec. then automatically returns to its previous mode 7 modes with run times from 4.5 to 24 hrs. USB-C rechargeable; charge time is 2 hrs. Mode Memory powers it on in the last mode used IP64 rated for water and dust resistance Low battery level indicator