Riō PMP300
| Brand | Diamond Multimedia, Riō |
| Function | Media Player (MP3 Player) |
| Produced | 1998 |
| Country | USA |
| Form Factor | Portable |
| Signal Path | Digital Hardware |
| Dimensions | 3/4 in x 2 5/8 in x 3 5/8 in |
| Internal Memory | 32MB |
| Displays |
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| Links | Computer History |
| Notes | This is said to be the first portable MP3 player. |