Topram USB 3.0 SDXC Card Reader / Writer supports 4GB 8GB 16GB 32GB 64GB 128GB SD SDHC SDXC MicroSD MicroSDHC MicroSDXC Memory Card - Model RV33 (Bulk Packaged) USB 3.0 Super High Speed SD Card Reader / Writer. Fully Plug & Play and Hot Swappable. Backward compatible with USB 2.0 and USB 1.1 Data Transfer rate: up to 5Gbps via USB 3.0 / up to 480Mbps via USB 2.0 / up to 12Mbps via USB 1.1 (***IMPORTANT NOTE: USB 3.0 port required for high speed transfer***) Supports SD, SDHC, SDXC Cards up to 128GB in Capacity. It also works with MicroSD, MicroSDHC, MicroSDXC, MiniSD and MiniSDHC cards with an adapter (adapter is NOT Included).