This is the PC-262S plug adapter [used] that converts a stereo mini jack to a φ2.5mm ultra-small stereo mini plug. This plug adapter is used when listening to a radio with a stereo ultra-mini jack with headphones that have a stereo mini plug. Operation has not been confirmed, so there is no warranty after purchase. Please understand that this is a used item, and we ask that you purchase it with no returns and no claims.