On Hold Plus 6000 Digital Music On-Hold Flash memory - 16 MB of on-board flash memory stores over 57 minutes of awesome sounding content. Additional Secure Digital Cards (not included) can add over 9 hours of content for continuous playback USB connection - Connect to your PC via USB to add new content or update firmware PC connection, strictly optional - Unit uses PC only to update content stored in flash memory. Updated content can optionally be added by copying an MP3 or WMA audio file to a Secure Digital Card without the unit ever being connected to a PC or Network Ready to go right out of the box - Pre-loaded with several files containing great sounding music mixed with intermittent thanks for holding... messages. Just plug it in and walk away. MessageStudio software - Allows users to create new on-hold audio content with voice and music on their PC with a few mouse clicks. Then, just transfer the file directly to the unit's on-board memory, to a Secure Digital Card, or upload to a server for a network update. Free personalization - A free professionally voiced, personalized on-hold production is provided to the customer automatically when a product is registered. One Year Warranty.