Assertion: doorbell's battery | /r/HasProperty | internal
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Source sentences:
text: And finally, the Arlo also has an internal battery that provides about five minutes of back-up power, which is enough to give you a live view, send alerts, and record whatever’s going on outside your house.
text: Some doorbells even require this, like the Ring Pro or SkyBell HD, since they don’t have an internal battery.
text: The Ring Doorbell comes with an internal battery, allowing it to power itself without relying on your doorbell’s existing wiring (in case you want to keep your existing doorbell as well).
text: While you can run the Ring Doorbell off of traditional doorbell wiring and not bother with recharging the battery, its big feature is that it can be powered completely by the internal battery so that you don’t have to mess with any wires, making installation super easy.
text: The Ring Video Doorbell and the Ring Video Doorbell 3/3Plus can use either a wired connection or run off internal batteries.