Specification: Color: blue Material: resin + metal Size: length 4.3CM ,width 2.3CM, thickness 1.2CM The module features are as follows: 1. Support Micro SD card, Micro SDHC card (high speed card). 2. On-board level conversion circuit, the interface level can be 5V or 3.3V. 3. Power supply is 4.5V ~ 5.5V, onboard 3.3V regulator circuit. 4. The communication interface is the standard SPI interface. 5. 4pcs M2 screw positioning holes for easy installation.