Thanko released a compact portable wristband style music player - Wristband MP3 Speaker - 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. With the Wristband MP3 Speaker, music will follow you to the kitchen, garden, bathroom, etc.
It plays music saved in a microSD card.