【Ultra High Speed Transmission】Multi SD card reader Built-in USB 3.1 chip, the transmission speed is MAX up to 312MB/S. The Type-C interface supports plug-and-play, compatible with Type-C smartphones and tablets, cameras, sports cameras and so on. 【SD Card Reader& Storage 2in 1】Multi-functional SD card holder case integrates memory card storage and ultra-high-speed data reading functions. As a card case, it can accommodate 2 Nano SIM cards, 4 SD cards, 6 TF cards. As a TF/SD card reader, SD and TF dual card slots support data transfer all at once. 【Widely Compatibility】MicroSD/SD card reader adopts dual card slot design, compatible with SD/SDHC/SDXC/MicroSD/MicroSDXC/MicroSDHC memory cards. Compatible with Windows 7 and above, Mac OS 10 and above, Linux, Android, iPad OS. You can easily save the photos inside the SD card to your iPhone/iPad/Mac/Camera, view the photos and videos in the memory card anytime and anywhere, and upload them to social platforms, it is a good partner for your travelling and playing. 【Bi-directional Transfer】Memory sd card reader supports batch uploading photos and videos to transfer to your iPhone/iPad/Mac/Camera, reducing waiting time , and also supports you to save the data from your mobile phone or computer to the SD card through the sd card reader. 【Durable & Portable】This SD card reader featuring an aluminum-alloy shell with a rubber case, offers robust protection. Its compact size and carabiner clip make it the perfect portable micro SD card holder case for on-the-go use. IP65 waterproof level to protect your sd cards. Note: Data transfer is only available for OTG-enabled Type-C interface phones and tablets; a Type-C to USB-A adapter is required to connect to a desktop computer. If your card is SD 4.0, the ideal transfer speed is 312MB/S; the transfer speed is also affected by the network environment and device performance.