With three-stream 802.11ac technology, the AirPort Extreme Base Station takes Wi-Fi speeds over the top. You can reach data rates of up to 1.3 Gbps - triple the previous 802.11n standard. Which means up to three times faster Wi-Fi. 2 You also get double the channel bandwidth, with 80 MHz-wide channels providing more room for more data to flow faster than ever. And if you have 802.11 a/b/g/n devices, AirPort Extreme maximizes that connection as well. What you do with all that extra speed is up to you.
AirPort Extreme features simultaneous dual-band 802.11ac Wi-Fi. That means it transmits at both the 2.4 GHz and 5 GHz frequencies at the same time. So no matter which band your wireless devices use, they will automatically connect to the best available band for the fastest possible performance.
Apple AirPort Extreme Base Station - radio access point