The ultra-compact Nano Light II keychain light provides steady, bright light for one hour of run time with a single AAAA alkaline battery. Easily attaches to key rings and zippers and fits in your pocket without taking up a lot of space. For every BCRF Pink Nano Light II sold, Streamlight will donate $1 to the Breast Cancer Research Foundation. By purchasing this product you are helping to make a difference in the fight against breast cancer.