For non-phone system applications with integrated analog interface to support 1-4 lines. CD auto-load plus CD autoload/MP3 digital-on-hold audio system (for analog & KSU-less phone systems) - MP3-based on-hold player with secure digital (SD) & USB interface. 128 MB of on-board memory storage (approx. 8 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. Includes 2 X 500P/TEHMAs