Some services offer cellular back up should
this occur. Look for a home security system with a full line of wireless peripherals, including modules for controlling lights and appliances, thermostats, cameras, motion sensors some can distinguish between a pet and a person, water sensors, and glass break and vibration sensors. Look for long life battery power, too. Lithium sensor batteries, for example, can last three to five years. When they do run low, the system lets you know well
in advance. Choose a controller with back up battery so the system will stay active in the event of a power outage or if the Internet is down.