I was able to play, record, and output sound using my AC adapter and headphones. Recording was done via LINE analog connection. The main body's key operations are also OK. I used a third-party AC adapter (5.3V, 650mA). All other detailed functions have not been confirmed. This is an old item, so there is no warranty. *Includes the main unit and rechargeable battery (operation not confirmed). *There is dirt on the back. Please judge the condition from the other images.