In an earlier thread, John Edward went through the effort of measuring a variety of small personal cassette players to determine which is the worlds smallest. His findings officially state that the Sanyo JJ-P4/P5 is the world's smallest personal cassette player.

I now have a JJ-P5 and can see why John made this claim. This is an amazing and tiny player, very thin, with nice sharp edges. It's beautifully designed and engineered with a solid feel. The placement of the buttons is clean and the sound is fantastic. Kudos to Sanyo for creating this remarkable little unit! (Let me know if you all want to see pictures.)