Elecom introduced 2 new models of compact speakers for smartphones today:
ASP-SMP120 (ball-shaped) and ASP-SMP220 (cube-shaped). Both will be released in early July.
Both of them plays music in your smartphone or iPhone (or any other device with a stereo mini jack) by paired up using a stereo mini plug. They have 2 φ50mm drivers and each of the drivers outputs 300mW.