The additional transmitter is used with the Voice Alert. You can add as many of these transmitters as areas you'd like to protect.

VOICE ALERT SYSTEM-6 is a new annunciator system featuring wireless PIR (passive Infra-red motion detector) sensors transmitters and a remote receiver/ speaker base unit. Users record their own alert messages and are then notified with their own voice message when activity in a monitored zone is detected. For instance, Zone 1 could be for a driveway alarm - "Car coming up the driveway!" Zone 2 could guard a side entrance against intruders. When this PIR detects movement the Base Unit could play back "Someone's on the patio" and trigger a floodlight using one of the four "C" relays included on the Base Unit. Zone 3 could be used by the entrance to the backyard pool. When triggered, this Zone plays back "Kids are by the pool." Zone 4 might be used to detect movement in your prized garden. You could record "Is there a deer in the garden?" to be played when the sensor for this zone is triggered near your garden. System-6 can monitor all four zones simultaneously and still have two additional zones available (along with their own custom messages), if required.

Users can alter their messages and place the wireless sensors wherever they wish. Voice Alert System-6 sets up in minutes and can be completely customized to fit their individual needs. The wireless PIRs feature: all weather protection, adjustable mounting and sensitivity, and can send a signal 300 feet through walls and up to 1000 feet in open space.