0_Apprentice
Do you use headphones often?
1_Wizard
Yeah I do. I use them to convert electrical signals into sound. 
0_Apprentice
That's cool! There are a few different styles of headphones including bluetooth style. Are you familiar with those?
1_Wizard
Yes! There are also different types like the circumaural headphones while go over the head. 
0_Apprentice
Do you know how long headphones have been around?