Double as a high-speed card reader and a memory card protective case. With a built-in USB 3.1 chip, the transmission speed is up to 310MB/S; SD and TF dual card slots support data transfer at the same time; Can store SD card*4,TF card*6, Nano SIM card*2 Suitable for cameras, smartphones, drones, action cameras users; Made of aluminum-alloy shaped at one go; IP54 protection; Compatibility Devices: Cameras, smartphones, drones, action cameras Memory Cards: Compatible with UHS-II,SD 4.0 Norm: UHS-II, SDXC, SDHC, SD Cards UHS-I, SDXC, SDHC, SD Cards UHS-ll, Micro-SDXC, Micro-SDHC, Micro-SD Cards UHS-l, Micro-SDXC, Micro-SDHC, Micro-SD Cards Systems: 7 and above, OS 10 and above, Linux, Android, OS. Note: Data transfer only applies to Type-C port phones and tablets that support OTG; To connect with a desktop computer, a Type-C to USB-A adapter is required. Colour:Black Material:plastic Package Contents: 1 x High-Speed SD Card Reader Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.