Small sound reproducers resembling miniature speakers used either singly or in pairs, usually attached to a headband to hold the phones snugly against the ears.
"I wanted to send this to thank you for the great job you did on our wedding music cd's- the quality is exceptional, they arrived back in short time and great shape. I've already told my friends about your great service! It's nice to know there is a place to send music to be restored and captured for posterity! Thanks!..."