The Peephole Reverser is a viewing device developed to aid law enforcement in measuring potential dangers and to quickly view in real time any activity behind any door with a peephole. This is the newer, updated version that has improvements to provide a clearer view inside the room in a discreet manner. Its specially designed lens is designed to negate the peephole lens effects allowing for a unimpeded view through the peephole into the room. The Peephole Reverser is effective on all the most common brands that are used in homes, apartments, and hotels. It's 2.8 inches in length, weighs only 2.2 ounces, and has a view field of 15 degrees.