1. [On December 5, 1 USB hub] 5 interface USB 3.0 HUB: 3 USB 3.0 port and SD/TF card readers. With the USB A adapter, one of your computer's USB ports is three, 3 USB devices at the same time, keyboard, mouse, hard drives, USB disk and much more; The other 2 -term card reader and more for SD/SDHC/SDHC/Micro SD/TF cards and more. Do not use both the memory card reader. Also compatible with USB 2.0/1.1/1.0. It is also effortless to transfer data or share your files in your daily life/business. The cost is effective and efficiently (both card readers could not be used at the same time)), Surface Pro, MacBook, Mac Pro/Mini and compatible with many USB 3.0 devices. It is appropriate to buy, use and install. Ultra thin and light USB center can take it anywhere, especially for work or travel. Excessive voltage, excessive current, short circuit, high temperature quartet protection, portable belly with more stable use.