The Patio Door Guardian effectively secures and childproofs sliding patio doors in homes and balcony doors in apartments/condos. Created with home security in mind, this lock is also ideal for childproofing. Prevent children from leaving the home unattended. Attractive and functional, the Patio Door Guardian also allows you to lock the door with a 3″ gap for ventilation. It works on right and left handed doors. The Patio Door Guardian is white.