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Clock Radio with MP3 Alarm - August MB300 - Wake to your Favourite Music from USB and SD or FM Station - Rechargeable Portable Speaker with Remote Control [Dark Wood] : Amazon.co.uk:
mp3 Music Player Video Alarm - Apps on Google Play
Flyron FN-A501 ] MP3 Alarm Speaker/MP3 Player Siren - Negative Trigger Version | eBay
A sheet metal Arduino MP3 alarm clock | Arduino Blog