Features:

• 4 GB storage capacity with 3.66 GB available
• Minimum write speeds of 15 Mbps
• Includes adapter for use with Memory Stick PRO compatible devices
• Transfer speed up to 160 Mbps
• 4 GB of storage for your compact digital camera, portable audio device, or PSP Handheld Entertainment System not for camcorders DCR series

Editor Reviews:

Product Description:
4GB memory capacity * supports read and write speeds of up to 15 Mbps * some memory required for system management * SDMI-compliant MagicGate encryption technology *

Rating : - Excelent buy! And cheapest I've seen.
This is a good deal for only 44 dollars you get 4GB MS Pro Duo. Usually this type of memory cost more than SD and Micro SD; but I was glad to find this on the internet. Shipping arrived on time, would definitely buy from this person again another day.