The Scotty sea-light features the Scotty ball system joint design that enables a smooth and complete full range of motion for the Stream-Light the corrosion proof construction of this system provides a long service life in both fresh and salt water applications as it is designed with stainless steel fasteners and a stainless pole.This 838 also offers an ACR detachable, fully sealed LED c-light and bright 20 lumen white LED for location Assistance during emergencies. The easy twist on/off activation is waterproof tested and the impact resistant construction is USCG/solas approved. The c-light is easily removed and can be attached to life jackets, backpacks, or can be hung from a pocket. C-light requires two AA 1.5V batteries (batteries not included).