Simultaneously Read & Write 2 Cards for PC and Phone UGREEN Type C Card Reader is an ideal choice for fast and efficient data syncing from TF/ SD cards to a USB-C laptop or OTG phone. It reads 2 cards simultaneously for all Type-C laptop with Windows, Linux or Mac OS system, keeping you away from repeatably changing flash cards. Note: For Samsung S8/S8 Plus, Google Nexus 5X/Nexus 6P, Microsoft Lumia 950 XL, LG V30 G5, OnePlus 5/3T/3, Huawei P9/P10 smartphone, it supports simultaneous 2 cards reading. Super Speed Data Transfer USB C card reader is allocated with USB 3.1 interface with highest transmission speed up to 5Gbps, perfectly saving your time. Plug and Play, Easy to Use No driver needed for various OS, such as Mac OS X, Windows 7/8/8.1/10, Linux, Android 5.0 or above. Universal Compatibility USB C Laptop: Apple Macbook Pro 13" 2017 2016, Macbook Pro 15" 2017 2016, iMac 2017, New MacBook 12"(2015&2016), Google Chromebook Pixel (2015), Dell XPS 13 (2 IN 1, 9350& 9360), XPS 15-9560, Lenovo Yoga 900/910, Huawei Matebook etc. OTG Type C Smartphone: Samsung S8/S8 Plus/Note 8, Google Pixel XL/2/2XL, Google Nexus 5X/Nexus 6P, LG V20/ V30/ G5/ G6, Moto Z, Microsoft Lumia 950 XL/950, OnePlus 5/ 3T/ 3, Huawei P10/ Mate10 etc. OTG USB C Tablet: Samsung Galaxy Tab S3 9.7, Samsung Galaxy Book, Lenovo Tab 4, Asus ZenPad 3S, HP Elite X2 , ACER SWITCH ALPHA 12 etc. Dual Card Slots Compatibility SD Slot: Support UHS-I (SD, SDXC, SDHC, RS-MMC, MMC Micro) TF Slot: Support UHS-I (Micro SD, Micro SDHC, Micro SDXC) Important Notes *It supports cards up to 512G. *The transfer speed will be affected by two cards used simultaneously.