NOW EVOLUTION EV-64AMX Portable MP3 Music Player ( Windows PC / Mac ) Plays back MP3 files from 32Kbps to 320Kbps sampling rate, and Variable Bit-Rate (VBR) files Reprogrammable for emerging audio formats ? firmware upgrade ready via USB 1.1 interface (cable included) 64MB built-in Flash memory SmartMedia Card slot accepts optional cards up to 64MB SSFDC ( Solid State Floppy Disc Card) compliant