Evo23,  Your system has a Dell Wireless 1703 802.11b/g/n (2.4GHz) which works on 2.4GHz ONLY.   Rick
 To Anyone:            I have a bit of a conundrum at the moment. It started off with the fact that My laptop can find both bands on my network. So out of curiosity I did what everyone does and searched online. And I ended up at the Dell support page to see if indeed my laptop came with a dual band wireless adapter. Which I honestly doubt by this point. But anyway, I used the service tag on the bottom of my laptop to find out the specs. And it came up with the wrong laptop. Figuring that I had typed it wrong I used the "Detect My Device" and once again the wrong laptop came up. I know this because my laptop....isn't a touch screen.  So If anyone can help me figure out exactly which version of Inspiron 15 laptop I'm using and whether or not I have a dual band adapter it would be highly appreciated! 
Wrong Laptop in support