Problems 1 and 2 with iPod Nano 7G described below

Problem No. 1: I have followed the recommended steps for activating the sensor (Nike + Fitness) in my 7th generation iPod Nano to no avail. Is there really a built-in sensor in this iPod Nano as part of the Nike + Fitness?

Problem No.2: Songs remain on the screen of the iPod with an active/playing appearance when in fact there is no sound to indicate the songs is actually playing. I have taken several troubleshooting measures without satisfactory results.