AP Photo/Mike HouseholderThe cameras offer a wide view from wherever they are positioned. Homeowners get phone alerts with streaming video if the doorbell rings or the device's heat sensors detect a person or a passing car. Ring's basic doorbell sells for $99, with recurring charges starting at $3 a month for users who want footage stored. Ring says it stores the recordings for two months. Many law enforcement agencies nationwide said the idea to partner with Ring came after the company promoted its product at law enforcement conferences. Some departments have chosen to simply use Ring's Neighbors app, which encourages residents to share videos of suspicious activity.

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Its excellent video quality shows enough detail day and night, even though it didn't perform as well as some competitors in our testing.

• personal alert systems
• security monitoring services
• emergency response system

If you think you might want to switch to home automation in the future, check that the security company and equipment you buy allow for an easy transition.

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2. small business alarm system
3. residential door security