The ACR C-Strobe is an intense incandescent strobe light that runs for over 8 hours. This slim lightweight safety light is designed to fit in a pocket, hang discreetly when attached to a life vest or jacket, and when using the C-Clip, easily attach to the inflation tube of most inflatable vests. Waterproof and corrosion resistant case has a twist on/off control than can be operated by gloved hands, even in adverse conditions. Operates on 2 AA alkaline or 2 AA 1.5V lithium batteries (not included). 6" x 1.6".