ONKYO Remote Control RC-527S ★ Uses 2 AA batteries ★ Compatible with CD, MD, CDR, DVD, and TAPE ★ Sleep mode ★ Name recording function ★ Repeat function ★ Surround sound function, and many more This is an accessory that came with the purchase of an ONKYO CD component system. I was using it normally until I disposed of the main unit in August 2025 (^^) I wanted to check the operation before listing it, but I have already disposed of the main unit, so the operation has not been confirmed. Please understand this before purchasing. ※ There is some slight aging on the battery holder.