The volume goes up higher as you turn up the volume knob, but within the range there are 3 levels and these are there to show you how the noise reduction will work. This computer is a renewed product, but I would never have guessed by looking at it or using it. The neck is very wide and baby will grow out of this before the neck fits! The company is sending out a replacement which should be here after 01/23/21. If you care at all about sound dont buy the Betrons, but these. If you squeeze it with both hands you can touch your palms. I only have 1 pair of ears. It needed some slight rearranging so as to not block the front facing camera for FaceID but other than that very easy to set up. Fish:* Sautéed Cod with Cod Cakes and Parsley Oil I especially liked the cod cakes. So, in reality, you could use the left one for up to 8 or more hours, and then use the right ones while the left is charging.