2 Slots - SD/MMC + Micro SD. Support SDXC up to 2TB, SDHC, SD, MMC, RS-MMC, Micro SDXC, Micro SD, Micro SDHC Card and UHS-I Cards.Build-in Card Cap to Use as a USB 3.0 Flash Drive: It allow you store the Micro SD cards inside the memory card reader, and don't need to worry about losing the cards.Plug and play; Hot swapping; USB power (no external power or battery); Supper speed USB 3.0 and backward compatible with 2.0/1.1.Auto detect memory card; Support SDXC up to 2TB, SD V3.0, UHS-I standard, latest Micro SDXC and MMC 4.4.24-month manufacturer's warranty and Free lifetime technical support.ROCKETEK - Easy Your Life Without DelayRT-CR5 SuperSpeed USB 3.0 SD Card Reader base on Easy portability design, with a build-in Card Cover, it is able to store a Micro SD Card inside the memory card reader, and don't need to worry about losing the micro sd card, and use it as a USB 3.0 Flash Drive.It allows you to easily add a USB 3.0 multi-slot card reader/writer to your USB 3.0 enabled system.The Rocketek USB 3.0 SD / Micro SD Card Reader is a great option for anyone looking for an easy way add support for the most common storage media types used in common digital cameras, MP3 players, and mobile phones,etc.Features-2 slots: SD/MMC + Micro SD/T-flash-RTS5306 chipset-LED indicator for working status-Build in Card CoverCard Compatibility-SD Slot: SDXC/UHS-I SD/SDHC/SD/Extreme SD/Extreme III SD/Ultra II SD/MMC(mini SD/mini SDHC/RS-MMC/HS RS MMC may need a adapter)-Micro SD(TF) Slot: Micro SDXC/Micro SDHC/Micro SDSystem Requirements*Windows 10, 8, 7, Vista, XP*Mac OS 9 and above*Linux: Modern kernel 2.x & 3.x based distributions with USB Mass storage support