GIANCOMICS LED Bike Light Front & Rear Set - 3 Modes CREE Zoomable Superbright Bicycle Headlight and 500 Lumens Taillight for Bicycles/Climbing/Hiking/Kids Bike/Walking Easy to Mount High quality and useful LED bike light( ^_^ ) Convenient to carry everywhere with a drawstring bags; Material: non-toxic and no odor metal aluminum + plastic; Size: headlight: 4.3"*1.1" (no-stretch)/ Taillight:2.6"*1.5"; holder is easy to mount without other tools and attachment to any bike Headlight: 3w power enhance light intension and distance; adjustable focus light (zoom in and zoom out); weather resistant; diamond shape light head Headlight: 3 modes choice (High&gt;Low&gt;Strobe) and CREE Q5 LED light; use 3 AAA batteries or 18650 battery (should add extra battery extension ring) Taillight: 500 lumen taillight: long lifetime superbright with 5 high led ligths and 7 modes; use 1 X 2 AAA batteries Kind notice: all batteries are NOT INCLUDING, removes battery if not use for long period; working for night cycling, walking, riding, jogging, camping outdoor CS wargameand road emergency; produced by GIANCOMICS