This is a SONY portable CD player, model D-321. I acquired it used in 2020. I still use it in combination with headphones and a mini amplifier. Since purchasing it, I've occasionally disassembled and cleaned it, but currently, there are no problems. Playback, sound output, operation of various buttons, and display are all OK. There is no scratchiness in the volume control. There are no signs of battery leakage in the battery compartment. The exterior has some minor scratches on the top cover. *See image 7 - Brand: SONY - Model: D-321 - Type: Portable CD Player - Power: DC 4.5V external power supply or 2 AA alkaline batteries - Country of Manufacture: Japan - Serial Number: 248864