Your key will always be there where it should be have you left your key in the house or your children come home and dont have a key you wont need to worry in the future the people who know the 4 digit code can access the house key and be able to get in this is ideal for safe storage of the replacement car key or second house key etc size approx 80 x 126 x 40 mm 4 digit number code chose the code yourself sturdy casing with cover 4 screws are included for wall mounting