USB C to SD Card Reader Writer OTG Adapter Micro Memory Card Reader Card Reader A Few Notes USB C smart phones or other USB C devices must be support OTG function.  Device with USB 3.0 would only run about at 400Mbps. Make sure the form of your SD card is FAT32, if not, please backup the files on your SD card and format it into FAT32, all the smartphone on the market can not recognize the files in NTFS.  NOT Applicable: iphone/Amazon Kindle/Fire Table/SIM Card/Memory Stick(MS) Card/Compact Flash(CF) Card. Feature: Plug and Play：This USB C SD card reader adapter, No need to download Apps, plug, and play. You can quickly transfer FAT32 format data files from your SD TF card to Type C devices, release the space of the storage anywhere and anytime.  Quickly Transfer：The USB C SD card reader, fast reading and writing the files you need. 5Gbps/400Mbps transmission speed. Quikly transfer the data include pictures, videos, audios, and files from your USB storage or cards to the droid devices.  Portable Design：USB C SD card adapter, mini compact portable design, Lightweight yet durable, for easily take it to anywhere, at home, on the go, in the office, in the car, etc.  Wide Compatibility：For Windows 10/ 8/ 7/ Mac OS Chrome OS etc for 2019/2018/2017/2016 MacBook Pro/Air.MacBook 2015/2016/2017 for iMac/iMac Pro 2017, iPad Pro. Usage method: The mobile phone supports OTG.  Some mobile phones need to enter Settings>Debugging>Allow data access.  If the chuck is not ejected for some models, check the file management.  Operation sequence: insert the memory card into the card reader first -- then insert the mobile phone.  When the connector is fully inserted, you will hear and feel the feeling of jamming.  You can try to remove the phone case (the connector retains part of its length, and the normal phone case does not affect its use)  Replace the memory card to test and eliminate the memory card problem.  Replace the equipment for testing and eliminate product problems. Package included: 1 x USB 3.0 OTG Adapter