Remote house/flat door bell unit has front door plate with door bell ringer/two way speech interchange and roving wireless response unit providing householder interaction/door opening.

摘要

The door bell unit has a base station (1) mounted on the wall where the front door is, and relaying door chimes and speech (8) using a radio signal (3). The house owner has a mobile wireless radio responder (2) which allows the caller to speak to the house owner, and to activate door opening.