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. _Double-sided FOB features the Breast Cancer Pink Ribbon on one side and the Streamlight logo on the other side _Non-rotating snap hook for easy one-handed operation _Machined aircraft aluminum construction _White LED delivers up to 10 lumens _Parabolic shaped LED area optimizes beam performance _Runs up to 8 hours using four IEC-LR41 coin cells _ Rotary head switch _ Just 1.47 inches!