Connection type: Wireless Purchased on Amazon. Bought approximately 4 years ago and used as one of several pairs of earphones. It has a used feel as it's been some time since purchase. Connection, noise cancellation, and ambient sound mode all work without issue, so it's still usable. The left earphone has been lost, so it's just the main unit and the right earbud. I will carefully disinfect it with an alcohol wipe before shipping.