Fangrui Product Details 4 In 1 Usb Camera Connection Kit: Usb Otg Port / Charging Port / Micro-sd(tf) Port / Sd Port (not Included: Sd/tf Card) Supports Simultaneous File Reading And Device Charging. Enjoy High-speed Pass-through Charging While Using, And Sharing Not Stop Due To Lack Of Power. Note: Sd Card And Tf Card Cannot Be Read At The Same Time. Sd/micro-sd/usb, Only Read 1 Card The Digital Camera Adapter Supports Memory Cards Up To 512gb And Usb Flash Drives Up To 256gb. The Sd Card Adapter Can Copy Photos And Videos To Your / In A Short Time, With A Speed Of Up To 60 Mb/s-90 Mb/s, Saving More Time. The Micro-sd Card Reader Brings More Convenience To Your Work And Life. The Usb Adapter Is Suitable For Occasions. Micro-sd Card Reader Is Widely Compatible With More Usb Devices, Such As Kubs, Mouse, Keyboard, Usb Stick, Usb Flash Drive, Camera, Microphone, Digital Camera Piano, Etc. Please Note: Why Does It Heat Up During Use Answer: The Usb Flash Drive Heat Up When It Is Working. When It Is Powered On, The Adapter Reads