Plug in the power adapter. Wait 2 to 3 minutes until the LED indicator lights (Power, WAN, 2.4G, 5G) turn solid green or blue.
The answer depends on your contract status.
IEEE 802.11ac Wave 2 (backward compatible with 802.11a/b/g/n) Frequency Bands: Dual-band concurrent 2.4 GHz and 5 GHz