No 2.4Ghz Wifi using the physical WiFi On/Off switch, only 5Ghz. - Home Network Community
Amazon.com: TP-Link N300 Wireless Extender, Wi-Fi Router (TL-WR841N) - 2 x 5dBi High Power Antennas, Supports Access Point, WISP, Up to 300Mbps : Electronics
How to disable Wi-Fi function of TP-Link wireless router
TP-LINK Router Setup for Smart DNS Proxy - Smart DNS Proxy Support