Very small portable speaker XBoom (NE A2)

XBoom Mini "capsule" speaker in black, with original cables and bag, lightly used and still working

This is *not* a Bluetooth speaker -- it needs to be plugged in using the same type of connection as common earbuds. It should work with phones, MP3 players, etc., which don't require USB or a proprietary connector.

It was something of a marvel when it came out over 12 years ago but it does not sound as good as recent iPhones (and probably other recent cell phones).