The installation is very simple. People only need to paste it behind the door. Due to its unique design, it can be used with American and European door locks. It has a wireless keyboard on the outside and an encrypted Bluetooth-compatible application that allows people to enter its attributes with a simple code or click, but still use the original keys. People can share temporary virtual keys with people they trust Virtual Password |,Anti-peeping Unlock,Anti-peep virtual password, enter it casually，as long as 1 of them is correct, Safe and Reliable. To Prevent Electromagnetic Attack,It has the openning ability of anti magnetic and electric field,technology to prevent coil from unlocking and effectively improve the safety of locks, Manufacturer: DMETE