Well, the documentation is a bit confusing.
In the technical specification, on page 14, section 1.9, it says that the stick has dual band ac-7265, and in section 1.9.1 it says that it supports "n".
However, in the quick specs, Intel® Compute Stick STK1AW32SC Product Specifications , under I/O, it only says "Intel® Wireless-AC 7265 + Bluetooth 4.2 ", not dual band, or any other information.
I would be inclined to go with what the tech spec says, while we wait for one of the Intel support staff to confirm.
The WiFi adapter supports b/g/n/ac and dual band as mentioned in this document (page 2): Intel® Dual Band Wireless-AC 7265 Brief
2.4 GHz and 5 GHZ is mentioned under network specifications here: Intel® Dual Band Wireless-AC 7265 Product Specifications
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Thank you very much for taking the time to reach the Intel® Communities Team.
I understand you are having an inquiry about the wireless card embedded in the Intel® Compute Stick STK1AW32SC. I will be more than glad to assist you further.
As Al Hill and leonmerts mentioned in the posts above, in the Technical Specification of this model, on page 14, section 1.9 it specifies that the wireless card embedded on this Compute Stick is the Intel® Dual Band Wireless-AC 7265, which in its Technical Specifications it specifies that is compatible with the "n" standard. Please bear in mind that the "ac" protocol is backward compatible with the "b" standard so this Compute Stick may connect without any problem to your router.
I hope this answers all your questions.