To use the 5GHz, your WiFi router must have dual-band WiFi support . It Should support IEEE 802.11 b/g/n/ac or WiFi 4 and WiFi 5 on 2.4GHz and 5GHz bands. Dual-band routers have the option of setting the same SSID/WiFi name for both 2.4GHz and 5GHz bands. D-Link calls this “smart connect“.