Description: This is a card adapter used for Micro SD card reading/writing, via file system and Serial Peripheral Interface driver program, single-chip microcomputer system.User can directly use the IDE SD card library to complete the initialization, reading and writing of card. Features: The card adapter support for Micro SD card, for Micro SDHC card. It has level conversion circuit, namely, interface level can be 5V or 3.3V. Power supply is 4.5V to 5.5V, it has 3.3V voltage regulator circuit. Communication interface is the standard Serial Peripheral Interface. Designed with 4 M2 screw holes, easy to install. Specifications: Interface Level: 3.3V or 5V Support Card: for Micro SD card (<=2G), for Micro SDHC card (<=32G) Control Interface:Total 6 pins (GND, VCC, MISO, MOSI, SCK, CS), GND is ground; VCC is power supply; MISO, MOSI, SCK are Serial Peripheral Interface bus; CS is chip selection signal feet. 3.3V Voltage Regulator Circuit:LDO regulating output 3.3V as power supply for level conversion chip, for Micro SD card; Level Conversion Circuit: Signal for Micro SD card is converted into 3.3V, control interface of MISO signal is transformed into 3.3V, general AVR single chip microcomputer system can read the signal. Size: 4.5*2.5cm/1.7*0.9in Quantity: 5pcs Weight: 5g(approx.) Package Includes: 5 x Modules 1、The card adapter support for Micro SD card, for Micro SDHC card. 2、It has level conversion circuit, namely, interface level can be 5V or 3.3V. 3、Power supply is 4.5V to 5.5V, it has 3.3V voltage regulator circuit. 4、Communication interface is the standard Serial Peripheral Interface. 5、Designed with 4 M2 screw holes, easy to install.