The doorbell runs on two AA lithium batteries, and Blink says that with a wired installation or paired with a Sync Module 2, the included set can last up to two years. Customers can save clips locally without a subscription if they add a sync module and USB flash drive or opt for the Blink Subscription plan ($3 monthly) that adds the ability to record, save, and share events. It works with Alexa and can also send event notifications via the Blink app or to an existing in-home chime.
It looks like a far better deal than the Ring Video Doorbell (way longer battery life and also option for proper local storage).
See
Blink’s first doorbell is finally released, four years later#
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homesecurityThis $49.99 item can use a set of AA batteries for two years.