Module features are as follows: 1 Support Micro SD Card, Micro SDHC card (high-speed card) 2 the level conversion circuit board that can interface level is 5V or 3.3V 3 power supply is 4.5V ~ 5.5V, 3.3V voltage regulator circuit board 4. Communication interface is a standard SPI interface 5. 4 M2 screw positioning holes for easy installation