Dual Slot designed with one SD Card slot and one Micro SD (TF) Card slot Up to UHS-I high speed data transfer only apply for one card read situation. This function only compatible with devices that have a USB-C port. Compact and portable design at 2.4 inches in length and 0.25 oz in weight. The red LED Light on the memory card adapter verifies USB bus power and active data file transfer. No external drivers or power required Wide Compatibility: Fully supports the transfer speeds of newly released memory cards including SD-XC, SD, SD-HC, Micro SD-HC, Micro SD-XC, Micro SD, and Micro SD-HC Product can use for Apple devices with Thunderbolt 3 ports and for PCs and devices with type-C ports