GSM Door Bells operate via GSM technology or local Wifi network. They are especially designed for companies where are not staff at all times.
When the mail or courier arrives, the driver push´es the “door bell” but immediately connects to the company staff by telephone. Procedures can be agreed upon immediately. The door phone has an integrated door opening system, so the electric lock has the ability to allow the driver to enter if necessary.
A door phone with a keypad can be used to open the door with a code number. A multi-channel door phone connects to multiple apartments in the property through the same device.