For a diy system you need internet, a hub (the brains) a siren and a few sensors. 199.00
Wink Lookout Smart Security Starter Kit with Wink Hub 2, Motion Sensor, Siren & Chime, Door/Window Sensors - - Amazon.com. If you want to get advanced it is easy to set this up to arm when you or you and someone leave the home based upon your location. Of course it automatically disarms when you arrive. That is if you carry a cell phone
Edit to add, no fee Of any kind. You can get notifications if there is an alarm or trigger other events such as turning on every light in the home or alert someone else (family, or other interested persons)