Intellitouch OHP7500 MP3 and CD Autoload Digital Player For Analog KSU Less Telephone Additional Telephone Extension Music Activator For Use With Illohp6500 & Illohp7500 For Pbx And Ksu Telephone Systems 128 Mb Of On-Board Memory Approximately 8 Hours Of Mp3 File Content Storage Loads Audio Into Digital Flash Memory For Continuous Playback Via An Integrated Cd Autoload Mechanism  Or User Can Connect It To Pc Via Usb To Add New Content Or Update Firmware