Thanko has released a compact portable wristband style music player for 3,480 yen.
Not like other regular portable speakers, the Wristband MP3 speaker stays around your wrist, so you can listen to music everywhere you go. For example, when you do household chores, you have to move around in the house.
It plays music saved in a microSD card.
Size: L280 x W45 x H25mm
Interface: microSD card slot, micro USB