In The BoxPack of 1,Model NumberMicro SD Card Module - SPI,ROHS ComplaintDimensionsWidth1.45 cm,Height1 cm,Weight6.5,Power FeaturesOperating voltage: 4.5V to 5V, Communication interface: SPI, 4 x M2 screw positioning holes for easy installation, Support Micro SD Card (<=2G), Micro SDHC card (<=32G) (high-speed card), On board level conversion circuit board allows interface level of 5V or 3.3V.,