Doorbell with over voltage protection device

The utility model discloses a doorbell with an over voltage protection device. The doorbell with the over voltage protection device includes a box; a display, a loudspeaker and matrix buttons disposed on the box; a PCB disposed in the box; a single chip disposed on the PCB; and a function conversion circuit, an over voltage protection device, an anti-theft alarm circuit and a doorbell calling circuit connected with the single chip at the external of the single chip. The doorbell with an over voltage protection device is provided with the single chip, and by the control of the single chip a camera can record the appearance of a visitor and the loudspeaker can be used by the visitor to communicate with a house-owner, when the visitor operates on the box and gets in touch with the house-owner, then the house-owner can open the door. When the door is not opened in a normal way, an alarm starts to warn, and when the house-owner is not at home, the visitor can leave a message through a recording device. The doorbel