Ive gone through 3 different 6. Can vary the headphone and mic sidetone volume separately on analog dials, on the side of the unit. The instructions can not be trusted. But comfortable shoe after breaking into. I ended up using a stapler to create the sleeve. Colors are vivid and bright as well. Large earcups5. I’m 5’ and my husband is 5’7”. I didnt care as much about the headphone quality. So I guess it works if you work in a toll booth and do not need to move at all all day.