Among the devices that can monitor a home when residents are away on vacation or at work are:
Video doorbells, allowing users to see who is at the door when they are away and respond.
Smart lock and keyless entry, which use voice commands or personal codes to open doors and can be set to unlock, for example, when a child is arriving home, and lock after the child is in the house.
Indoor and outdoor security cameras that detect motion or sound and enable users to stream live video to a smart device and archive recorded footage. Some cameras include a loud alarm that sounds when someone unwanted is in the house.
Read more: http://www.azcentral.com/story/money/business/consumers/2016/05/28/how-use-smartphone-protect-your-home/83253498/