Features: USB connection. 64 mb of on-board memory. For PBX and KSU telephone systems. Pre-loaded with fully licensed music and messages. Optional playback source via any off-the-shelf SD card. Playback options include repeat one, repeat all and random shuffle. Free professionally voiced personalized on-hold greeting offer. Includes message studio software to create on-hold message. Auto start after power loss and retains content in memory. Approximately 3 hours of mp3 file content storage. Backlit 6-line LCD control panel. Wall mountable.