Feature: The Module (MicroSD Card Adapter) is a micro sd card reader module, through the file system and the Spi Interface Driver, McU to Complete the File System to Read and Write MicroSd Card. Users can directly use comes with an sd card to complete the library card initiation and read-write.1. Supports Micro SD Cards, Micro SDHC Card (High Speed ​​Card) 2. Onboard Level Conversion Circuit That Interfaces Level for 5V or 3.3V 3. Power Supply is 4.5V ~ 5.5V, Onboard 3.3V Voltage Regulator Circuit 4.5V. Ation Interface Spi Interface 5. TShere's 4 M2 Screw Positioning Holes for Easy Installation 6 To Ground, VCC is the Power Supply, Miso, Mosi, SCK IS SPI BUS, CS IS THE CHIP SELECT SIGNAL PIN; Level Conversion Circuit: Micro SD Card Into the Direction of the Signal is Converted to 3.3V, MicroSd Card Interfaces to Control the Direction of the Miso Signal Is Also Converted Into 3.3V, General Avr nal; micro sd card connector A self-Bomb Deck, Easy Card Insertion.Positioning Holes: 4 M2 Screws Positioning Hole Diameter Is 2.2mm, The Positioning of the Module is Easy To Install, To Achievev .com/public/2kpndb/k000443.rarpackage included: 1x Micro SD Card Spi Adapter Interface Mini TF Card Read Write Module with Level Converter Chip for Arduino