Audible door entry systems can range from a basic one way to large complex blocks.
The entry phone system gives the owner the advantage to talk to the caller before the entrance door is opened.
A call from the external panel will buzz the handset within the property.
The occupant will lift the receiver and be able to identify the caller.
A button on the handset can be operated to release the external door lock.
Video Entry Systems:
Video entry systems work on the same principle as audible except the occupier will have visual verification of the caller.
A small camera is integrated within the external panel and as the caller leans forward to speak, the occupant will have a full image of the caller on a monitor built into their handset.