The mesh router made by D-Link: is this a stand-alone system, or does it need separate repeaters?

The D-Link COVR Whole Home Mesh WiFi System AC3900 includes a router and a seamless extender, indicating that it is not a stand-alone system and includes components for extending coverage.

Questions & Answers: D-Link COVR Whole Home Mesh WiFi System AC3900, Up to 6,000 sq ft, Router & Seamless Extender Wireless Internet MU-MIMO (COVR-3902-US)

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D-Link COVR Whole Home Mesh WiFi System AC3900, Up to 6,000 sq ft, Router & Seamless Extender Wireless Internet MU-MIMO (COVR-3902-US)

One seamless network: One seamless network provides lag free 4k HD video streaming and gaming throughout your entire home, upto 6,000 square feet
Advanced technology: 4 x 4 data streaming and MU MIMO technology for high speed connectivity
Smart steering: Cover will automatically connect your devices to the fastest wifi band for the maximum speed to all your devices
Quick & Easy setup: The D Link WiFi app makes setup easy
Network management: Parental Controls, guest network and WiFi scheduling for managing your home network on your terms
DLNA support: Compatible with your DLNA supportive media players, game consoles, and TVs

$125^.99 –