The Lexar MS1GB-40-431 Memory Stick has 1GB Memory. Additionally, it's compact, rugged, reliable, and comes equipped with built-in erasure-prevention. Lexar Memory Stick PRO lights when it writes with an exclusive Data Protection Light that flashes when you transfer data to and from it. Record your high-resolution digital images and store other types of data safely and can easily at a sustained write speed of 40X or 6.0MB per second*. Lexar Memory Stick PRO works with all Sony Memory Stick PRO compatible devices including your Sony MP3 audio recorder, video cameras, and computers with a Memory Stick slot. Memory Stick PRO also includes MagicGate--a copyright protection technology that provides secure transfer and playback of commercial and copyright content. Lexar Memory Stick PRO ships with a jewel case with the new Platinum logo.