Description *64GB Memory Stick PRO Duo *Interface: 10-pin Serial Memory Stick Interface and 4-pin Parallel *Operating Voltage: 2.7v-3.6v *Operating temperature range of -13° F to 85° F allows greater durability *Dimensions (Approx.): 0.79" x 1.22" x 0.06" (20mm x 31mm x 1.6mm) Package include: 1 x 64GB Memory Stick Pro Duo Compatible with: PSP (all versions) Tips on flash drive capacity: The unit of measurement is not uniform, resulting in data inequality (the difference between decimal and binary) The manufacturer of the memory card refers to the unit of measurement (decimal) of the international standard to indicate the storage capacity of the memory card, that is, 1 GB = 1000 MB. But in the world of computers, data storage is expressed in binary, 1GB = 1024MB. So there are some differences between display capacity and nominal capacity of flash memory product: 16GB is about 14GB-15GB 32GB is about 28GB-30GB 64GB is about 58GB-60GB