The Boxis eSafe parcel box is equipped with a black electronic lock with 4-digit code that is recessed almost flush into the letterbox. The electronic lock works on batteries. A key is supplied as standard so that you can open the lock at any time (if the batteries are empty, if you have forgotten the code, etc.). When you buy online, you give the code when you fill in your address. Refer to your eSafe in the field before your name as follows: "In eSafe PAKKETBUS CODE 2244 Henk Jansen." As an added security, you can provide your preferred delivery location 'eSafe parcel mailbox' to the courier. Once you have completed the form that can be found on the courier's website, the courier will be notified. After the parcel has been delivered, the user can select a different numerical code via the master code.