Planet Bike Grateful Red Bike Tail Light PB 28 LED power array and reflector provides steady, Courtesy & Superflash modes FL1 Tested - Run times: 26 hrs (steady  13 lm), 45 hrs (Courtesy  4-11 lm) and up to 150 hrs (Superflash - 13 lm) Highly visible, even in daylight Water resistance rated to IPX3 standard 2 AAA batteries (included)