iPod Nano 7th Gen. & Nike App

Good morning friends,

I am interested in purchasing an iPod Nano 7th Gen. for the fitness app but I have some queries - I've checked online and am a little more confused then when I started.

I understand that the Nike Fitness App doesn't need the shoe sensor in order to work. This is the main reason I am interested in purchasing the product; however, in the store the personnel indicated that the shoe sensor is required. I investigated this a little and now I am of the understanding that you can use the app without the shoe sensor for walking/running, but that having said sensor makes the app more efficient/accurate.

Could someone clarify this for me, and indicate which are the functions when having the iPod only or having the iPod + shoe sensor?

Thanks so much in advance!