The Streamlight STL 66210 MEGASTREAM USB Battery with USB Charger and Holster is an ultracompact and efficient lighting solution. This Nano Light II keychain light offers a steady bright light for up to one hour of run time powered by a single AAAA alkaline battery. Its convenient size allows it to easily attach to key rings and zippers and it fits comfortably in your pocket without taking up much space. This product is ideal for those who need a reliable and portable light source on the go.