GUARD lock with emergency escape function, easy installation for improved security. - Brand: GUARD - Model Number: No.557 - Accessories: 4 keys, instruction manual - Function: With emergency escape function - Installation: Easy installation Auxiliary lock for entrance doors [For outward-opening single doors] Easy installation, no tools required! Perfect for security in rental properties without drilling holes in the door or wall! No need to remove the lock when you return home. Since it remains attached, it's difficult to tell if someone is home or not! Anti-picking pins are used. 2 million key variations. Countermeasures against thumb-turn manipulation, picking, and cam-lock unlocking! By pressing a button, the metal fittings come off, allowing you to open the door from the inside in an emergency, providing peace of mind. I purchased and installed it in 2023, but it didn't work for my home. I removed it immediately on the day of installation, but there are some minor scratches from the work, so please refrain from purchasing if you are concerned. The packaging box is a tight fit, so I plan to separate the plastic case and the instruction manual. Recycled packaging materials will be used. Thank you for your understanding regarding home storage. Thank you for viewing.