Specification: Origin: Mainland China Type: Module Condition: New Features: Support Micro SD card, Micro SDHC card (high speed card) Level conversion circuit board, can interface level 5V or 3.3V Communication interface is a standard SPI interface Control interface: a total of six pins (GND, VCC, MISO, MOSI, SCK, CS), GND ground. GND is grounded, VCC is the power supply, MISO, MOSI, SCK is the SPI bus, and CS is the chip select signal pin; 3.3V voltage regulator circuit: LDO regulator outputs 3.3V as the power supply for level conversion chip and Micro SD card; Level conversion circuit: Micro SD card direction signal is converted to 3.3V, MicroSD card direction control interface MISO signal is also converted to 3.3V, general AVR microcontroller system can read the signal; Micro SD card connector: Yes, because the bomb deck allows easy insertion and removal of the card. Positioning holes: 4 M2 screw positioning holes 2.2mm in diameter, easy to install and position for inter-module combination; Power supply: 4.5V - 5.5V, 3.3V regulated circuit boards Positioning hole: M2 screw positioning hole diameter 2.2mm Control Interface: GND, VCC, MISO, MOSI, SCK, CS Product Size: 18.00x17.00x3.00mm/0.71x0.67x0.12inch Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x Storage Expansion Board Support Micro SD card, Micro SDHC card (high speed card) Level conversion circuit board, can interface level 5V or 3.3V Communication interface is a standard SPI interface Control interface: a total of six pins (GND, VCC, MISO, MOSI, SCK, CS), GND ground. GND is grounded, VCC is the power supply, MISO, MOSI, SCK is the SPI bus, and CS is the chip select signal pin;