Cateye HL-EL120 and TL-LD170 LED Bicycle Headlight and Tail Light Combination Battery-powered 1 white-LED headlight and compact 3 red-LED tail light with mounts Headlight offers flashing and constant modes Each light uses 2 AA batteries Headlight run times: 80 hours constant or 320 hours flashing Tail light run time: up to 60 hours