From the manufacturer

Arlo Pro Bundle

Arlo Pro HD Camera – Plus Audio Doorbell and Chime

Answer your door, even when you’re not home.

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Arlo Pro is a 100% wire-free indoor/outdoor security camera with rechargeable batteries and audio and can be added to any Arlo base station system.

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The Arlo Base Station securely connects Arlo, Arlo Pro, and Arlo Pro 2 wire-free cameras to the Internet.

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The Arlo Audio Doorbell replaces your traditional doorbell and lets you answer your door remotely from your phone or tablet.

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Arlo Chime gives you instant alerts anywhere in your home. It requires Arlo doorbell and system with base station.