Abstract: An apparatus for detecting the presence of people and generating an audio message and/or a video display directed to the person or persons whose presence has been detected. Message delivery is focused since the message is intended only for persons in the immediate vicinity of the subject of the message, and message repetition must be controlled to avoid constant repeating of the message during periods of high traffic. The invented apparatus implements the foregoing requirements by the use of a passive infra-red detector with a variable range control adjustable from approximately two feet to ten feet to preclude detection outside of an immediate, focused vicinity. In one embodiment, an EPROM message cartridge which may be plugged into the unit is used to store a message. The cartridges are removable so that they may be rerecorded using standard EPROM programming techniques. Alternatively, the recording medium may be built into the apparatus.