SD and TF card cannot be read simultaneously, it can only read one card once. 1x USB 2.0 HUB With SD/TF Card ReaderOR1x USB 3.0 HUB With SD/TF Card Reader. Card Reader: For SD/TF(Micro SD) Card. Cable Length:USB 2.0 HUB6 PortsAbout 0.9M//USB 2.0 HUB3 Ports About 0.1M/USB3.0 hub 3 PortsAbout 0.3M.
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