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Microtechnologies - Home Guard Monitor 500-2 With 30 Hour Battery Backup Remote Monitor with 30 Hour Battery This inexpensive remote monitor is an auto dialer that alerts two 20 digital phone numbers for your choice when power fails or temperatures become too cold. The Home Guard Monitor VM500-2 has a 30 Hour internal battery back-up. ALERTS: If over five minute power failure or below 45 deg F temperature. Unit dials two 20 digit phone numbers you choose. Easy Set Up: Plug in and enter dial-out numbers and PIN. HomeGuard home monitor is on duty. *Remote dial-in access: Immediate report of temperature and power status. *Preset power outage alert and temperature sensor alert. *Alerts two (2) 20 digit phone numbers. CANNOT leave message on answering machines. CANNOT dial a pager. *Integrated voice tells you the temperature and makes it easy to program. *Record a 10 second personal identification message over the phone. *Requires AC Power and Active Land Based Phone Line. *Power Alert: Dial-Out stops when power resumes or PIN entered. *AC wall transformer, splitter and telephone extension cable included. *FCC Approved and Registered. *Enclosure Dimensions 5 1/2" x 5" x 2 1/2". * THIS MODEL 500-2-B30 INCLUDES 30 HOUR BATTERY BACKUP. *One year limited manufacturer's warranty.