1. High speed 2. Great for storing pictures,music ,data ect. 4GB High Speed SD memory CardSpecification:Capacity: 128MB,256MB,512MB,1GB,2GB,4GB ... x 2.1mmWeight: 2gVoltage: 2.7V~3.6V Read speed: 5MB/sWrite speed: 2.5MB/s Operating Temperature: 0 degrees to 60 ... degrees Storage Temperature: Minus 20 degrees to 85 degreesProduct Notes:Great for ...