Use the USB 2.0 OTG interface to connect USB peripherals such as USB flash drives, hubs, keyboards, audio/MDI interfaces, SD and Micro SD card readers, etc. to an iPhone or iPad. Four in one design: The four in one adapter is an upgraded design of the three in one SD card reader adapter, which adds a fast charging port, so you never have to worry about your phone running out of battery when transferring photos.
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