Intellitouch OHP6000 Digital Player/Recorder for PBX and Key Phone Systems MP3 Digital Player Integrated analog phone line adapter module "Select" feature allows user to choose one or all music files stored in memory for continuous playback USB port and SD Card Slot Built-in monitoring speaker For Pbx & Ksu Telephone Systems 64 Mb Of On-Board Memory Approximately 3 Hours Of Mp3 File Content Storage Usb Connection Optional Playback Source Via Any Off-The-Shelf Sd Card