DESC: Digital music-on-hold LCD 6-line backlit display (displays ID-3 tags with descriptive names of tracks for easy identificat Built in flash memory: 16mb (57 minutes) Expansion memory: SMC Card Slot accepts 16, 32, 64 or 128mb Smart Media Card (max total memory 128MB Built-in analog phone adapter module (compatible with non-PBX/analog telephones, up to 4 lines by 50