You are buying the official Amazon supplied Eero 6 dual-band mesh Wi-Fi router system | with built-in Zigbee smart home (3 pack) 

This sale includes: 

1 x Eero 6 router 

2 x Eero 6 WiFi Extender

1 x Wall mount.

These are not the TalkTalk supplied ones will be deactivated once the seller’s broadband account ends and the devices will be bricked.

Features taken from Amazon:

Comprehensive Wi-Fi 6 home coverage: eero 6 covers up to 420 m² and supports speeds up to 500 Mbps.
Say goodbye to dead zones and buffering: eero’s mesh Wi-Fi technology optimises for yourspace—so you can confidently stream 4K video,game, and video conference across your home.
Supports 75+ devices: eero 6 uses the power of Wi-Fi 6 to increase the capacity and efficiency of your network.
Set up in minutes: the eero app walks you through setup and allows you to manage your network from anywhere.
Connect to Alexa: eero 6 doubles as a Zigbee smart home hub, making it easy to connect and control compatible devices on your network with Alexa.
Gets better over time: automatic updates bring the latest and greatest in eero Wi-Fi while also helping to keep your network safe and secure.
Easily expand your system: with cross-compatible hardware, you can easily add eero products as your needs change.
Extend your Wi-Fi coverage: Say goodbye to dead zones and buffering with eero Built-in on a compatible eero network and Echo device.