For small businesses, property owners, and more, the ALL NEW Model 400 offers an easy, inexpensive way to monitor a remote facility. It can be installed in any clean indoor environment to monitor a variety of applications. The 400 has a built-in ability to monitor for power failures and temperature fluctuations. There are also four external inputs that can be connected to a variety of sensors to monitor temperature, water on the floor, humidity, and much more. One of the four external inputs already comes with a temperature sensor for monitoring temperature where the 400 is installed. When an alarm is detected, the Model 400 can notify up to four people by making voice phone calls. It will continue to make phone calls until someone responds to the call. The voice messages can be custom recorded, so you get to describe each alarm message that it speaks in your own voice. The phone interface includes a line seize feature so that extension phones are automatically disconnected when it needs to make an alarm phone call.