Bi-directional transfer: SD card reader for iPhone supports bi-directional transfer from SD card to iPhone or iPhone to SD memory cards. It's easy to download photos or videos from SD cards directly to iPhone or iPad, and share them with friends and family members anytime. High Speed Transmission: The speed data transmission is very fast. The SD card reader can transmit photos and videos from your camera to your iPhone or iPad in seconds, saving a lot of time. Plug and Play: The SD card reader does not require third-party apps and just use the built-in iOS Files app. Please wait 5 seconds after connecting the device. Supports RAW files: SD card reader supports standard photo formats including JPEG, RAW and 4K video formats including H.264 and MPEG-4. The card reader supports memory card with a maximum capacity of 512 GB.