There´s no reference to it being Dual band (I´m going off how it is labelled in Device Manager>Network Adaptors). Unfortunately, Sony sold it´s VAIO division 5 years ago just after I bought this one (VAIO Flip SVF15N1C5E) online from the Sony site. I'm simply a little surprised because a have a considerably older VAIO with a considerably inferior spec, and yet with that one I can connect to my WIFI + network and also my 1st Gen iPad seems to be able to receive this network. I include below a screengrab of laptop specs and Device Manager screen;
MMars16, Thank you for posting in the Intel® Communities Support.
In reference to your question, the Intel® Dual Band Wireless-AC 7260 is a dual-band card, it supports both 2.4GHz and 5.0GHz bands as you can confirm in the following link:
Intel Customer Support Technician
A Contingent Worker at Intel