And the other 2 slots are for your SD memory card and micro SD memory card. Porodo 7-in-1 Aluminum USB-C Hub, USB 2.0 Port, USB 3.0 Port, USB-C... 2-slots card reader for SD/SDHC/Micro SD/TF cards (Please reference The Image to Insert SD & Micro SD in Different Orientations, and don't use both card slots simultaneously ) 【Convenient SD/TF Card Reader】: This is not only a USB splitter, but also a portable SD/Micro SD carder reader. Only one Hub is enough for all device, greatly saving purchase costs. 【5 in 1 Multifunctional HUB】: VIENON USB 3.0 hub with 5 interfaces: 1 USB 3.0 port, 2 USB 2.0 ports, SD/TF card readers. Also backwards compatible with USB 2.0/1.1/1.0. 【Wide Compatibility】: This 5 in 1 docking station applies to various devices: laptop, pc tower, XBOX, PS4, flash drive, keyboard, mouse, card reader, HDD, cellphone OTG adapter, printer, camera, USB fan and USB cables. Independent Chip Each interface is equipped with independent chip management, ensuring that the 7 interfaces run simultaneously without interfering with each other. Aluminum Housing Hard aluminum alloy frosted shell, fingerprint resistant, scratch resistant, and fast heat dissipation. With this USB hub, you can extend one of your computer USB port into three, which means you can connect three USB peripherals simultaneously, such as keyboard, mouse, printer, USB disk and etc. USB A & C Dual Port Compatible with macbook, imac, iPad and other lapotp/Tablet/desktop computer/all-in-one. VIENON USB 3.0 Hub with SD and Micro SD Card Reader 3 USB 3.0 ports, turn one of your computer’s USB port into three,3 USB devices work simultaneously is fine, such as keyboard, mouse,hard drives, USB disk and much more; Aluminum Angled Roper Stirrups 3 Soft blue light indicator the work status, 0.9cm ultra slim aluminum body, small, convenient and beautiful. USB C Hub with Memory SD/TF Card Reader, VIENON 5 in 1 USB 【User-friendly design】:Plug & play, no need any driver or setup. Usb Hub With Sd Card Reader UGREEN USB C Hub 4K HDMI, 3 USB 3.0, MacBook Pro, Surface IPad Galaxy Micro Sd Card