The module is a MicroSD adapter that can be used to read and write MicroSD cards by ISP interface. Arduino users can use libraries available for initializing the read / write.
MicroSD card slot module allows you to extend your memory capacity and access to read any microSD that can be insert to the module. AVR microprocessor can read the signal and it is converted to 3.3 V.
Control interface consists of 6 pins (GND, VCC, MISO, MOSI, SCK, CS); GND - ground, VCC - power, MISO, MOSI, SCK ISP pins, pin CS chip selection.