The card reader is backward compatible with older versions of SD cards. The USB connection is backward compatible with USB3.1/3.0 with Type-C, and 2.0/1.1 if converted. Respective speed limits apply. EASY TO USE: Plug & play with no drivers necessary. Bus-powered convenience with no extra power supply required. Works on Windows 8+, macOS 12+. FORM AND FUNCTION: Durable materials are used for a clean look and reliable operation. An LED is present to simply indicate power status. UNIVERSAL AND INTEGRATED: Has an integrated, 6” USB 3.2 Gen1 Type-C cable and is compatible with modern devices. Supports 5Gbps to host for maximum performance. TRANSFER CONTENT IN A BLINK: SDXC UHS-II card reader with both standard and microSD form factor support with speeds of up to 312MBps. Simultaneously transfer your files and media content through each slot.