Check the listing for details. 1 x TF Micro SD Card Module Mini SD Memory Module for Arduino AVR SPI Interface. Condition: New. Listed at 1.96 USD. Features: 1.Support Micro SD Card, Micro SDHC card (high-speed card). 2. The level conversion circuit board can interface level 5V or 3.3V. 3. Communication interface is a standard SPI interface. 4. VCC is the power supply, MISO, MOSI, SCK is the SPI bus, CS is the chip select signal pin; 5. 3.3V regulator circuit: LDO regulator output 3.3V as level converter chip, Micro SD card supply; 6. Level conversion circuit: Micro SD card into the direction of signals into 3.3V, Micro SD card toward the direction of the control interface MISO signal is also converted to 3.3V, general AVR micro-controller system can read the signal; 7. Micro SD card connector: yes, Since the bomb deck for easy card insertion and removal. 8. Mounting holes: 4 M2 screws positioning hole diameter of 2.2mm, easy to install positioning, to achieve inter-module combination. Specification: Condition:100% brand new Power supply: 4.5V ~ 5.5V, 3.3V Positioning holes: 4 M2 screws Control Interface: GND, VCC, MISO, MOSI, SCK, CS Size: 18.5 (mm) x17.5 (mm) Package Included: 1 x TF Micro SD Card Module Mini SD Memory Module for Arduino SPI Interface (pins soldered to pcb)