The Barska Deep Sea Floating Waterproof Range Finding Reticle Binoculars is a must-have for any mariners and marine animal watching enthusiasts. They're designed to float on water so that you won't lose them to the depths. For low light viewing, the compass lights up red with the push activated LED. Other robust features like Fully Multi-Coated lenses, 100% waterproof & fogproof optics, BAK-4 prisms for crisp images, Non-slip ergonomic rubber design for a secure grip, and heavy-duty and shockproof rubber armor make these binoculars perfect for all types of nautical activities. FeaturesBAK-4 Porro PrismsInternal Rangefinder & Compass Reticle (Right Eye)Push Activated LED Light for CompassDistance ScaleFloating Body