WonderSwan MP3

The WonderSwan MP3 is a digital music playback accessory that had been developed for the WonderSwan handheld console.

Features
It played back music through software included on the cartridge, which had a volume dial on the back. A memory slot could accept Toshiba SmartMedia cards or Sony Memory Sticks.

Releases
The WonderSwan MP3 cartridge was shown at the Tokyo Game Show in Spring 2001.