Sony MS-EX1G 1GB Memory Stick Pro-HG Duo Operating voltage: 2.7V-3.6V Average Operating Current (serial transer): max.65mA Average Operating Current(4bit-parallel transfer): 100mA(max) Average Operating Current(8bit-parallel transfer): 200mA(max) Transfer speed(8-bit pararell transfer): 480Mbps(theoretical max speed)