Scotty Sea Lights feature an intense incandescent light that is visible for up to two miles depending on weather conditions. The lens simultaneously focuses a beam of light straight ahead and a ring of light is present all around.Scotty Sea Lights run up to 8 hours on 2 AA batteries. Removable light is portable and can be attached to a life jacket. In addition to being waterproof and corrosion resistant, Scotty Sea Lights feature a twist On/Off control that can be operated by gloved hands and in poor weather conditions.