full title: Google Nest Wifi Router 2 Pack (2nd Generation) – 4×4 AC2200 Mesh Wi-Fi Routers with 4400 Sq Ft Coverage
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This product includes two router units.
Nest Wifi is a scalable and flexible Wi-Fi system. These Nest Wifi devices work together to blanket your whole home in fast, reliable Wi-Fi and eliminate buffering in every room – with coverage up to 4400 square feet. 
One Wifi router plugs into your internet provider’s modem to create your Wi-Fi network. The other extends the wireless network and keeps your connection fast to devices in every room. ?For more coverage, add Nest Wifi routers or points to your system.