An inexpensive but effective means of identifying callers before opening your door, gate, or barrier. The external audio Entrance Panel can be connected to a single internal phone, or numerous, in the case of multiple occupancy buildings, such as a block of flats or commercial premises.
The addition of an electric lock release to the entrance door will allow the occupant to permit access to welcome or authorized visitors via the internal phone(s), whilst denying entry to unwanted callers.
These systems which can also have video facility so that the caller can be identified visually. Whilst being a security measure, they are particularly useful to the elderly or infirm.