Amazon.com: Waterproof 8 GB SYRYN Swimbuds Flip Bundle for Swimming with Music | Drag and Drop MP3, AAC, M4a, FLAC Using PC or Mac (No Apple Music, Spotify, or Other Streaming Services) :
SanDisk introduces new 'shaking' MP3 player
Movement Activity Song: "Shake Your Egg!" Egg Shakers, Video, Mp3 Files
SanDisk Sansa Shaker: MP3 player or Happy Meal toy? - CNET