Had this since I was a kid. Considering its age it’s in fantastic condition cosmetically and still plays music :) It takes an AA battery. Comes with 1 cartridge which can be overwritten from the music currently loaded on there. Has the original optical cable, instructions can be downloaded from Sony website by doing a search on any browser for them with the model number. I’ll include some headphones too (not Sony ones) in order to have a listen.
eBay