Extension cable: pull out the card slot easily and quickly from the computer or car navigation Compatibility: Compatible with SanDisk SanDisk SDXC / Raspberry Pi / Arduino / GPS / DVD / DVR / LED / LCD Screen or Smartphone etc. Other options: 3 types of cable to switch (SD to SD/TF to TF/SD to TF), a real helper for upgrading the navigation map and music Package includes 1 x SD to SD card extension cable. If you have any questions, please feel free to contact us. Attention: if you change another SD card, do not remove the other end of the extension from the device inside. Please make sure to restart the device once.