Control Products Deluxe FreezeAlarm Custom Dual Temperature Power Alarm FA-D2 with Remote Switch and Aux. Input with voice message to 3 numbers / Quick Status Check Protect your home, cabin, computer room, nursery, freezer, refrigerator or any other temperature sensitive area Automatically calls up to 3 phone numbers when the temperature gets too low or too high, the power goes out, or if the back-up battery needs replacing With a simple phone call you can check the current temperature, whether the power is on or off, or the-Voltage of the backup battery Continuously calls all 3 phone numbers and gives a voice warning of the exact problem that is occurring Record your own alarm and greeting messages and select a security code to personalize your freeze alarm and protect unauthorized users from accessing the unit