This item has been confirmed to be in working order. This is an item for sale of the main unit only. I used an AC adapter with this unit and successfully played a music CD for approximately 70 minutes. I was able to skip to the next track and return to the previous track during playback. I confirmed that the two-stage mega bass function was working. I was able to increase and decrease the volume. I have confirmed the above, but I have not performed any other detailed checks. Also, I have not tested the battery operation, so its functionality is unknown. The unit has been cleaned. This unit does not have a speaker function, and earphones or headphones are required. =========================== The SONY Discman ESP is a portable CD player equipped with electronic shock protection. CD Walkman - Brand: SONY - Model Name: Discman ESP - Features: Electronic Shock Protection - Design: Portable CD Player - Serial Number: 5201219