Features: 1. Supports Micro SD and Micro SDHC cards (high-speed compatible). 2. Built-in level conversion circuit for seamless interfacing with both 5V and 3.3V microcontrollers. 3. Standard SPI communication interface. 4. Pinout: VCC (power), GND, MISO (master in, slave out), MOSI (master out, slave in), SCK (serial clock), CS (chip select). 5. Integrated 3.3V LDO regulator supplies stable 3.3V power to the level converter and Micro SD card. 6. Bidirectional level shifting: converts controller-side signals (MOSI, SCK, CS) down to 3.3V for the SD card, and shifts MISO signal from the SD card up to 3.3V — compatible with common AVR and other 5V/3.3V systems. 7. Features a spring-loaded Micro SD card connector for secure, easy insertion and removal. 8. Includes four 2.2mm-diameter mounting holes for M2 screws — enables precise mechanical alignment and modular stacking. Specifications: - Power supply: 4.5V–5.5V (input), regulated 3.3V output - Interface pins: GND, VCC, MISO, MOSI, SCK, CS - Mounting holes: 4 × M2 (2.2mm diameter) - Dimensions: 18.5 mm × 17.5 mm - Quantity: 5 pieces per pack - Note: Pins are pre-soldered to PCB. Package Includes: 5 × TF/Micro SD Card Modules (Mini SD Memory Modules) for Arduino and other SPI-based microcontroller platforms.