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With a long lamp life and extended battery burn time, you won't be left in the dark. The polycarbonate body is resistant to chemicals, water and corrosion. The convenient tail switch for constant on/momentary is easy to operate. The L1 is perfect in close quarter use. Powered by 4 LR 44 1.5V alkaline coin cell batteries (included). Comes with a break-a-way safety lanyard, and colored lens discs to preserve night vision. This handy light offers a lot for its size.Battery burn time: 130 hrs.Length 2.04 in.Wt. .9 oz.