The standout feature on the ICD-MX20 is the hybrid storage. It gives you the option of using the built-in 32MB flash memory, or utilizing Memory Stick Duo or Pro Duo media cards, providing virtually unlimited capacity. This is a great feature if you're at a long conference, and don't have time to download your files to a computer. Just put in a new Memory Stick Pro Duo media card, and keep recording. Each card can hold over 300 personalized folders, which makes organizing your audio a simple process. It's compatible with Dragon Naturally Speaking Preferred Voice to Print Software and USB 2.0.