I tested it with AA batteries. It powered on and played, but the CD started from the third track, or skipped from the second track to the fifth. The sound of the CD spinning also seems loud. Tracks also started playing automatically, even though I didn't press play. It's broken, being sold as junk. This is an auction for the main unit only; batteries are not included. - Brand: Panasonic - Model: SL-S100 - Type: Portable CD Player - Color: Black Thank you for looking.