Doorbell via 4G network to make call -New entrance intercom (door phone, entry system) and an ideal product replacing the traditional entrance intercom -Allows you to speak with visitors standing at your company or house entrance by simply pressing the door button and you can open the door for them while talking with the visitors by operating your handset -Gives you opportunity not only to know who is waiting in front of your company or house even while you are on holiday but also to control access -It does not require any special installation and wiring but only need to connect to the door latch and power supply for their operation since the door phone system permits communication via 4G networks