4 in 1 USB OTG Card Reader Compatible with /TF Card Camera Memory Expander 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 various 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 data. The adapter shell is made of heat-conducting material, and there is heat-conducting silicone inside, so the heat conduction is very fast. You feel heat when you touch it with your fingers. This is also a phenomenon of good heat dissipation. The certification chip is designed to be to high temperatures and not affect the USB flash drive and the device. Colour:White Material:plastic Package Contents: 1 x 4 in 1 USB OTG Card Reader