Air conditioner and fans leaves your window open; the Winlock is an open window protector!!! A homes’ window is the second most used entry spot for burglaries, use of window air conditioners and dual fans leaves your window unlatched and unlocked venerable for a burglary. The WinLock Safety and Security Lock is a first-of-its-kind product that promotes child safety and prevent burglary by interlocking the windows to the lower pane (inside) and top pane (outside) This visible deterrent made with steel connection protects the window at the center to provide dual double hung protection. WinLock protects the outside and inside of the window when others only protect the inside and can be easy removed by opening the top (outside) window an pushing it out. WinLock is easy to install with no tools needed and safeguards window appliances: Room Air Conditioners, Dual Fans, Portable A/C Ventilation, Closed Window Added Security and New Models of Air Conditioners U-Shaped and N-Shaped.