Privacy Safeguard: An ideal indicator of restroom privacy, large indicator window with VACANT (Green) or IN-USE (Red) within an area of 50 feet, to avoid unnecessary knocking from others. Easy Installation: This indicator lock with a universal latch is designed for most standard doors up to 2” thick, backset is adjustable from 2-3/8” to 2-3/4”, it has reversible handles for either left-handed or right-handed use.