Compliant with SD Spec Version 1.1 Compliant with SDMI digital audio devices Supports CPRM technology Operating voltage: 3.3 V Dimensions: 24 x 32 x 2.1mm Weight: 2 g Note Capacity loss problem: Some devices and card readers can't support higher capacity SD Memory cards. For example, a 2 GB or higher capacity SD Memory card sometimes only shows a memory capacity of 1 GB or less; or sometimes can't even be read by the device or card reader. Before purchasing any memory card, please consult your device manufacturer to confirm supported capacity. The actual available memory on the device is less than what is listed on the package. This is due to small discrepancies in file formats and algorithms used by various operating systems. In addition, a portion of memory space is reserved for system files and data sectors for better performance.