I've put in new batteries for confirmation. There are no noticeable stains, but I've marked any areas of concern in the images. #Panasonic #MiniCassetteRecorder #RQ-L100 with built-in speaker #PortableAudio #Panasonic - Brand: Panasonic - Model Name: RQ-L100 - Type: Mini Cassette Recorder - Speaker: Built-in speaker - Function: Recording function Playback, recording, counter, fast forward, rewind, and sound output have been confirmed to work. I don't have any cassette tapes on hand, so I haven't been able to confirm what the sound quality is like. Because it has a built-in speaker, you can enjoy it without headphones. Thank you for looking.