Despite being a few years old, the Google Wifi mesh router system is still a great choice to expand you Wi-Fi network.
Google Wifi remains one of the simplest, most value-packed Wi-Fi mesh systems
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Google Wifi - AC1200 - Mesh WiFi System - Wifi Router - 4500 Sq Ft Coverage - 3 pack : Electronics
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Google Wifi Review: A Wireless Mesh Router For Everyone
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Best Buy: Google Wifi AC1200 Dual-Band Mesh Wi-Fi System (3-Pack) NLS-1304-25 3-PACK