With a tough polycarbonate construction, multi-function switch mechanism and advanced design and engineering, the INOVA Microlight offers a bright LED lamp in a flashlight small enough to fit on your key chain.the INOVA Microlight is an ingenious micro LED flashlight, with a surprisingly powerful performance - it has an effective range of up to a 50-feet, and one-mile signal visibility. The Microlight also features four lighting functions and a water-and-crush-resistant body, plus a stainless-steel universal clip that attaches easily to keys, zippers, purses, backpacks, military gear and any number of convenient locations.Features/Specs: Four Functions: High Power, Low Power, Strobe and Signal Mode Run Time (up to): 22 hours Effective Range (up to): 50 ft Signal Visibility (up to): 1 mi Battery Type: 2-2016 Lithium batteries included Easy-Open/Snap-shut c