・This is the RC-678S remote control for the ONKYO digital surround system HTX-22HDX. ・It also works with SA-205HD, SA-205HDX, and other models. ・After cleaning, we have confirmed that all buttons emit infrared light. ・Operation has been confirmed after the above work. ・This is a used item, so there are some scratches that couldn't be removed, but I don't think there are any critical ones. ・Two AA batteries are required separately. Please prepare them yourself. ・If anyone needs it, please bid.