Comes with 3 USB3. 0 ports support data transfers at speed of up to 5Gbps and enable you to connect 3 USB peripherals simultaneously. Designed with dual card slot, this product supports SD memory cards and TF memory cards of up to 256G and 480 MbpS high speed transmission. It is made of high quality aluminum alloy material. Expansion dock comes with TYPE C interface, which is support positive and negative insertion. The length of the item is 86.5mm, width is 23.5mm and thickness is 10mm. This product is suitable for home, household, dorm, office, etc. This USB 3.0 expansion dock is also compatible with USB 2.0. Item Name: Expansion Dock Material: Aluminum Alloy Features: Lightweight. Compact, Multi-function Color: Gray TYPE C Interface: Positive/Negative Insertion USB3.0 x 1.5A Extension: 5 Gbps(Compatible with USB2.0) Card Slot: SD/TF(256G Capacity, 480 MbpS High Speed) Size Details: 8.65cm x 2.35cm x 1cm/3.41" x 0.93" x 0.39" (Approx.) Notes: Due to the light and the screen setting difference, the item's color may slightly differs from the pictures. Please allow slight dimension difference due to the manual measurement. Package Includes: 1 x Expansion Dock(Others Not Included)