The Model VB-2 2-way Audio and Remote Command Module with Voice Prompts is designed as an add-on accessory for the DVS-1200, DVS-2400, and DUAL-824 Security Systems. Each module plugs directly into the unit's circuit board. The modules provide voice prompts for operating the system and voice feedback for remote command of the system through a pushbutton telephone. The VB-2 module features 2-way audio and audio listen-only capabilities for Central Station monitoring.