The best home security systems of 2021: Live monitoring, DIY kits, video doorbells and more

By CNET
Best DIY system: SimpliSafe Home Security
Best professional installation system: Comcast Xfinity Home
Best video doorbell: Nest Hello
SimpliSafe Home Security
"Best DIY system"
Comcast Xfinity Home
"Best professional installation system"
Nest Hello
"Best video doorbell"
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