The ACR C-Light is an intense incandescent safety light that's visible for up to 2 miles. This slim lightweight 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 batteries (not included). 5.6" x 1.6".