https://techcrunch.com/2018/07/23/arlo-adds-a-smart-doorbell-to-its-home-security-offerings/

Netgear home security spinoff Arlo just added another key hardware piece to its growing portfolio of connected devices. The Arlo Audio Doorbell is a kind of Ring/Nest (to which it bears a pretty striking resemblance) competitor that sends calls to the home owner’s smartphone every time someone buzzes the door. Visitors can either talk to the user or leave a voicemail message.

The product, which runs on two of AA batteries (getting around a year of use, according to the company) or can be wired directly into the house’s electrical system.