Automatically dials any telephone number when the temperature inside your home, cabin or business drops below 45°F (7°C) * Continues to call until the alarm is acknowledged ? calls every 15 minutes or every 2 hours (user selectable) * Operates during a power failure* (uses 2 AA batteries for back-up power ? not included) * Calls out to warn if the backup batteries are low and need replacing * Uses existing telephone line, DSL or VOIP phone connections*