This particular Shield system comes with the SimpliSafe base station (which plugs into the wall), six entry sensors, two motion sensors, a keypad, and a key fob so you can easily arm the system when you leave. Like many other systems on this list, SimpliSafe doesn’t require any tools to install. Just stick the sensors to your windows and doors, pair them with the mobile app, and you’re ready to go. SimpliSafe sells additional sensors so you can expand your system as needed. It is compatible with Amazon Alexa. 
ADT formed in the 1800s as American District Telegraph, the world’s first telegraph-based alert system. Now America’s largest provider of hardwired and wireless home security equipment and monitoring, it’s one of the oldest security companies in the country and has an A+ rating with the Better Business Bureau. With highly customizable packages and monitoring plans, it’s easy to make upgrades or keep your system simple.
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