Package contains: 5x micro SD card reading and writing module. Input voltage: 3.3V or 5V alternative. Board size 4.1cm x 2.4cm. Support Micro SD card, Micro SDHC card (high-speed card). Communication interface is the standard SPI interface. The power supply is 4.5V~5.5V, and the onboard 3.3V voltage stabilizing circuit. Control Interface: GND, VCC, MISO, MOSI, SCK, CS. This micro SD card board module adopts a pop-up micro SD card slot. Through programming, you can read and write to the micro SD card that using for arduino. It is compatible with 5V and 3.3V level master controller , which is very convenient to connect with a variety of singlechip microcontrollers, such as Arduino, Raspberry Pi, for micro SD card reading and writing.