Fujinon Mariner XL 7x50 cut both weight and cost without cutting corners. They're 100% waterproof with bright fully-coated Fujinon optics and extra-long (18mm) eye relief. The compass and reticle display are clearly visible through the left eyepiece. For use after dark, an energy-saving LED nightlight is built in. The control pushbutton and battery are located in the right tube. This exclusive new design not only makes it easy to use the Fujinon-Mariner XL compass at night, it also reduces the chance of electrical interference affecting compass accuracy. For added protection, should your Fujinon-Mariner XL ever go overboard, its closed-cell foam flotation neck strap will keep it safely afloat for easy recovery. For added protection, should your Fujinon-Mariner XL ever go overboard, its closed-cell foam flotation neck strap will keep it safely afloat for easy recovery. Neckstrap, objective lens caps and dual eyepiece cap are standard accessories..