Protection Plus- Sliding Glass Door and Window Accessory Sliding glass door accessory that helps prevent glass door mishaps. It is a visual marker and a lock that is effective for locking windows too. No installation required applies with a suction cup. For anyone that has ever owned a home or visited a home with a sliding glass door, walking into one of those doors can cause embarrassment, not to mention an injury. The Protection Plus helps to eliminate these mishaps, and also functions as a door-locking mechanism that prevents someone from being able to break-in through a sliding door. Once suctioned to the glass, the Protection Plus serves as security for a partially-open door, since it holds the door in place to prevent it from opening any further. Parents can also use the product to prevent their children from opening the door and wandering out, or it can be used as a ?third handle? on the door to help children go in and out freely.