Pocket Rockers was a portable music player aimed at children, and introduced by Fisher-Price in 1988.
Unlike other personal stereos of the time that were based around the Compact Cassette, Pocker Rockers used a small proprietary endless-loop cartridge (more like a miniature 8-Track) each containing two songs licensed from popular artists. When the first song ended, a switch on the player allowed you to switch to the other track.
The players came with a built in speaker, and a headphone jack. Accessories such as external speakers and tape storage systems were also available.
They were advertised with the tagline ‘Tiny Tapes, Tiny Players’ and came in a range of colourful designs. They were a fashion item as much as a music system (the tapes came with a belt clip that meant they could be worn) and were briefly popular enough to be banned in some schools.
By 1991 though, falling sales spelled the end for them.