Bicycle LED Rear (Tail) Light & Helmet Light & Safety Light & BackPack Light BATTERIES INCLUDED (2 X CR2032 batteries/EACH) 3 LIGHT MODES: SOLID, FAST STROBE, SLOW STROBE 50 HOURS ON STEADY & 150 HOURS ON FLASH SUPER BRIGHT & WATERPROOFT & 240 WIDE RANGE MOUNT ON HANDLEBAR, SEAR RISER, FORK, BACKPACK, HELMET ETC