BOSCH B444-V Conettix Plug In Cellular Communicator | eBay
AT&T + B444-A cellular module = $50 off!
How to determine which antenna to use with the B44...
BOSCH SECURITY SYSTEMS B465-MR-1640 Fire Alarm System Communicator Kit, Includes B465 Dual Path Communicator/B10R Medium Enclosure/D101 Lock and Key Set/D1640 Transformer/D8004 Enclosure/B46 External Annunciator - Nexlar E-Commerce