Similar in size to MultiMediaCards, Lexar Media Secure Digital (SD) Cards are designed for use in many digital devices including digital cameras, MP3 players, PDAs, cellular phones and camcorders. The Lexar Media SD Cards have an erasure-prevention switch to keep your data safe. When the switch is in the locked position, it will stop you from accidentally copying over or deleting data stored on your card. Now you know your data will be safe. Reliability and durability are critical to ensure your data is there when you need it. All Lexar Media SD Cards are tested and manufactured to the highest quality standard to assure you there is no need to worry about lost or missing data. With the small size and solid-state design of the SD Cards, they are perfect for mobile applications and users.