Just Checking is easy to install. Sensors are simply stuck to door frames or woodwork with Velcro and there is no wiring. The controller, which receives data from the sensors and uploads it to the web-server, plugs into a power socket anywhere in the house. Out of the way in spare bedroom is a good site.
Instructions are sent out with the Just Checking system, and our telephone helpline is there if you need help. You can also watch the video here.