THP201 Features: -Phone alert monitoring.-Power failure, freeze and flood home monitoring system.-Automatically calls up to three different phone numbers of your choice in the event of power failure, freezing conditions, water leakage or flooding.-Connects to existing telephone lines.-Installs in minutes - no special wiring required.-Selectable 5 or 30 minute initial call-out delay and continues calling for up to 10 hours if needed.-Clear voice message identifies problem. Includes: -9v Battery backup included. Dimensions: -Overall dimensions: 3" H x 6.25" W x 1.5" D. Disclaimer: -Freeze warning activates at 45 F.