I used it, but I didn't use it very often, so it's in good condition. It has been cleaned and disinfected before being put up for sale. The ear hooks are soft, so they fit your ears and you can wear them without feeling any pressure. Open Ear K6 Wireless [A New Concept in OWS Earphones - Unprecedented Openness] Earaku's "K6" is a new concept in OWS earphones. It uses air conduction to transmit sound to the inner ear through the air without entering the ear canal, eliminating the feeling of pressure and stuffiness, and eliminating the worry of ear sweat, reducing pressure from long hours of wear. Because it doesn't insert into the ear, there is no risk of damaging your hearing, protecting your ear health. Furthermore, you can still hear the sounds around you even while wearing the earphones. You can enjoy music while being aware of approaching cars, etc., and avoid accidents.