"Yes,Right here!" / mailbox

In terms of readability, different colors are more noticeable than different letters. At a large office building or an apartment building, many mailboxes are gathered together at the entrance. It takes a while to locate your among them with the exact number on it. This mailbox makes your room number stand out when you have a mail delivered. When a mail is put into your mailbox, the cover goes down and the number takes a different color.
/ You open the box and take out the mail
/ The cover will be closed automatically by magnet.
And semi-automatic
Ready !