This 6 lumen microlight offers four lighting modes and is housed in a durable body that's less than 2'' long. It also features a universal clip for secure attachment to a key chain or zipper pull, and comes with easily replaceable batteries. Powered by 2-2016 Lithium coin cell batteries, the Radiant 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 (high power, low power, strobe, and signal mode) and a water-and-crush-resistant body. Run time is 10 hours on high and 22 hours on low.