Amazon.com: AC1200 WiFi Extender Up to 2640sq.ft and 30 Devices, Up to 1200Mbps, Dual Band 2.4G 5G WiFi Range Extender, 2 Ethernet Ports, Internet Booster, Wireless Repeater,Works with All Router Modem :
Should I use 2.4 GHz or 5 GHz WiFi? | CenturyLink
1200Mbps Router Wifi Booster 2.4G Wifi Long Range Extender 5G Wi-Fi Signal Amplifier Repeater Wifi AE-1200-5G-REPEATER
How to Connect to Only 2.4GHz or 5GHz Wi-Fi Band (Prevent Switching)