Reducing bias is tricky.

You want engagement from a. Mobile users who b. Use headphones c. With their phone, and the type of headphone connection is the end goal.

“How often do you use headphones with your phone, and are they wired/wireless” is clonky, but gets everything out there without too much leading. People more awake than me can help more.

*I use wired $9 shitty earbuds, daily. The Bluetooth ones are nice, but I lose them and the battery life sucks, and it’s a hassle.