This full-view periscope allows stealth viewing over boulders, high brushes, backyard fences, and around corners. Three rugged, light-weight sections telescope for a reach over 4 feet high to let you see all those out-of-reach views. Flip the Mega View Periscope upside down and a full 16 inches is submersible for underwater viewing – on docks, poolside, lakes or beaches.