4GB Genuine Transcend MicroSDHC Class2 TF Card Fully compatible with SD 2.0 Standards. Only 10% the size of a standard SD card. SDHC Class 6 compliant. MicroSD adapter allows it to be used in standard SD Card slots, compatible with all SDHC-labeled host devices. Easy to use, plug-and-play operation. Built-in Error Correcting Code (ECC) to detect and correct transfer errors. Complies with Secure Digital Music Initiative (SDMI) portable device requirements. Supports Content Protection for Recordable Media (CPRM). Allows In System Programming (ISP) for updating firmware. Supports auto-standby, power-off and sleep modes. Mechanical write-protection switch. RoHS compliant. Size: 32.9 mm x 15.3mm x 7.7mm Op. Voltage: 2.7V~3.6V Op. Temperature: 0°C(40°F) ? 70°C(158°F) Durability: 10,000 insertion/removal cycles