4 in 1 USB OTG Card Reader Compatible with /TF Card Camera Memory Expander2656
1 x 4 in 1 USB OTG Card Reader. SD/Micro-SD/USB, only read 1 card. The Micro-SD card reader brings more convenience to your work and life. Answer: The USB flash drive heat up when it is working. When it is powered on, the adapter reads data.