Truly tiny, the Nanolight is a weatherproof, personal flashlight featuring a 100,000 hour life LED. Includes a non-rotating snap hook for easy one handed operation when attached to a keychain. Batteries included. Streamlight helps light the way to a cure. For every pink Nano Light sold, Streamlight Inc 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. The Breast Cancer Research Foundation is an independent 501(c)(3) not-for-profit organization whose mission is to achieve prevention and a cure for breast cancer in our lifetime by providing critical funding for innovative clinical and genetic research at leading medical centers worldwide, and increasing public awareness about good breast health.