[Plug and play] No need to download apps. After inserting the memory card and connecting for iPhone for 5 seconds, click the "Photos" app and find "Import", then import videos and photos from the memory card to your devices [Dual card slot] This card reader supports SD and TF cards, Secure Digital (standard SD/SDHC) cards. Wi-Fi SD memory cards are not supported [Female USB interface] The 8-pin to female USB adapter is an OTG camera adapter for iPhone/iPad, supporting digital cameras, SLR cameras, and the USB camera adapter does not require an app, nor does it require the camera's memory card to be removed. You can also insert USB flash drives, card readers, USB headphones, electric guitars, MIDI keyboards, etc. (the maximum current of peripheral devices does not exceed 500mA). Printers and hard drives are not supported [Two-way transfer] Two-way transfer for iOS 13-16 devices. Import data from SD/TF card to for iPhone/iPad, or export files for iPhone/iPad to SD/TF card. Including movies, music, Word, Power point, Excel, PDF, etc. [High-speed data transfer] Supports fast transfer of standard photo formats, including JPEG, RAW, and SD and HD video formats, including H.264 and MPEG-4. Easily and quickly transfer photos/videos to devices, and share camera images/videos to social media anywhere