The Inova Microlight is an ingenious precision engineered micro LED flashlight with surprising performance. From its tough polycarbonate construction and multi-function switch mechanism to its LED lamp, the Microlight is subtle but very effective. Powered by 2-2016 Lithium coin cell batteries the Microlight offers advanced design and engineering in a key holder-size lighting instrument with up to a 50-foot effective range and up to a one-mile signal visibility. The Microlight also features four lighting functions, 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.