Cellule Amulet Black This is an electric lock system compatible with door widths of 41-50mm. I purchased this from the QVC TV shopping site, but I made a mistake and bought the wrong size. There are signs of it being installed once. It has not been used because the size is incorrect m(._.)m Please confirm the door size above. I will also include 4 smart keys. If the size is correct, your home will have an auto-lock feature, which is great! There is also a manual. Thank you. m(._.)m - Model Name: Cellule Amulet - Color: Black - Size: Door Thickness Door Width 41-50mm - Accessories: 2 Remotes, Batteries, Instruction Manual - Price: ¥64,980 Thank you for viewing. Smart Lock Security Burglary Prevention Electronic Lock Double Lock Add-on Key Aftermarket Lock SwitchBot