Plug and Play: nothing required for using this memory card reader,you don`t need a computer or download any drivers to make it work,just plug it into the devices and you will be able to read the card by your phone after 5 seconds reaction. High Speed Transmission: The data transmission speed up to 20MB/S~30MB/S for this memory sd card reader for iPhone. 512 GB maximum capacity supported for the memory card. Two-way Transmission: Support two-way transmission above ios 13, you will be able to transfer images,videos or files between devices and the card reader.(NOTICE:two-way transmission does not supported on iOS9.2-12.4) Multiple Formats Supported: the iPhone SD card reader adapter supports multiple photo formats like JPEG,RAW,and 4K video formats like H.264 and MPEG-4.whats more,it also transfer files like Word, Excel, and PDF, etc. Tool for photographer: It is a Photography Accessories,No App to be downloaded. 5 seconds after inserting the memory card and connecting with the phone, click 'Photos' APP and find 'Import', then import video and photos from memory card to your phone or pad.