Powered by 2-2016 Lithium coin cell batteries, the Radiant micro light is an ingenious micro LED flashlight, with a surprisingly powerful performance. It has an effective range of up to a 50 ft and one mile signal visibility. The micro light 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.