This Card Reader for SD and microSD cards to be used with both, an Android device and the PC. The compact design makes it an ideal companion for traveling. USB OTG is a specification that allows USB devices such as a tablet or smartphone to act as a host and store data directly to memory cards. (Without PC) Micro USB for Android USB connector for PC Support high-capacity SDXC, micro SDXC memory card (up to 128GB) Support SD v2.0 UHS-I specification Can be used on Android smartphones & tablets with OTG function LED indicators provide read and write status Support Windows XP and newer, Mac OS X 10.4.5 and newer, Linux 2.4, Android 2.3 and newer with OTG The micro USB port of the smartphone or tablet device must act as host USB OTG only supports FAT32 (NTFS is not supported)