Remember that little flashlight your grandma had on her keychain? Remember the sad little pool of brown light it produced? This is not that flashlight. This one-ounce keychain flashlight is engineered to put up to four times the illumination of a typical keychain flashlight (the company rates its light output at 10 lumens). It's sturdy too with an anodized aluminum case unbreakable polycarbonate lens and O-rings to keep the moisture out. The high-intensity LED is rated to last up to 100000 hours and the four alkaline ''button'' batteries (included) will give you up to 96 hours of run time. For a flashlight that fits in your pocket it's hard to beat the KeyMate for durability and lighting power