The niterider sentinel 150 rear light is an eye catching light with a trick up its sleeve the sentinel 150 incorporates three powerful leds to produce a retina searing daylight visible 150 lumens allowing you to be seen day or night the sentinel has 5 modes from a constant beam to a flashingstrobe is usb rechargeable and has a unique safety feature laser lanes the laser lanes mode is designed to project ultra bright laser lines on the ground giving the rider their own virtual lane