The Inova Microlight is an ingenious precision engineered micro LED flashlight with surprising performance. From its tough polycarbonate construction to its multi-function switch mechanism to its LED lamp, the Microlight is subtle but very effective. 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. Dimensions: (length by diameter) 1.85" H x 1" W .325"D Weight: .35 oz. Lumens: N/A Runtime: Up to 15 Hours Effective Range: Up to 50 ft Signal Visibilty: Up to 1 mile Battery Type: 2-2016 lithium