MP3 digital-on-hold audio system (for PBX & KSU phone systems) - For use with PBX or KSU phone systems. MP3-based on-hold player with secure digital (SD) & USB interface. 64 MB of on-board memory storage (approx. 4 hours). Pre-loaded with fully licensed music and messages. Includes MessageStudio, a do-it-yourself recording, mixing and editing software for creating your own on-hold messages. Auto start after power loss and retains content in memory. LCD control panel. Ready to go right out of the box. Wall mountable. Backlit 6-line LCD control panel.