Also, professionally installed systems typically offer less flexibility. If you move, you may have to pay to have the system reinstalled at your new place. 3 options for DIY ersWant to take home security into your own hands?Let's narrow the options. At the very least, you'll want to monitor your home's exterior using a smart camera, such as the Nest Cam, which sends live video to your phone and detects motion and loud noises. You can get two outdoor Nest Cams one for your home's front entry and one for the backyard for $298. ISmartAlarm's Shield Package $613. 90, which includes eight contact sensors, seven motion sensors and three remote tags, is well suited for a three to four bedroom home, the company says. Photo by iSmartAlarm — The Washington PostLooking for a more comprehensive security system?Consider iSmartAlarm, a top performer according to CNET, Consumer Reports and PCMag. Its Shield Package $613. 90, which includes eight contact sensors, seven motion sensors and three remote tags, is well suited for a three to four bedroom house, the company says. The Abode Essentials Starter Kit $229 includes one door/window sensor, a battery powered security camera and motion detector, and a key fob.