1) Card form factor: SD card (secured disk) 2) Card size: 32 x 24 x 2.1mm 3) Capacity: 512MB ~ 4GB 4) Interface: SD, SPI, I/O supported serial interface 5) Number of pin: 9 6) Weight: 2g 7) Current: 100mA max. 8) Operation voltage: 2.7 ~ 3.6V