The product description
Color: RT – CR2-4.0
Special ush-ii SD/Micro SD 4.0 card reader adapter, Rocketek 4 slot USB 3.0 memory card reader/writer, built-in Sandisk/Toshiba/Lexar ush-ii/SD/TF card cover
Rocketek ® 11 in 1 SuperSpeed SD/TF card reader 4.0 using portable design, built-in card cover, memory card can be stored in a memory card reader, don’t have to worry about lost.
It allows you to easily add a USB 3.0 multi-slot card reader/writer to a system that supports USB 3.0.
The Rocketek USB 3.0 dual SD/Micro SD card reader is an excellent choice for people looking for simple ways to add support for common types of storage media like digital cameras, MP3 players and mobile phones.
High speed data transmission
The latest SD/Micro SD 4.0 technology: allows you to quickly capture and transfer high-quality photos and 1080p full hd, 3D and 4K video, and read transmission speeds up to 210MB/SEC – 250MB/SEC.

Characteristics of the
– this card reader can read two different memory CARDS at the same time.
-4 slot: SD/MMC * 2 + Micro SD/t-flash * 2
-LED indicator light is kept on when working state power connection is made, and flicker when transmitting data
– built-in memory card cover

Memory card compatibility
-SD slot: SDXC/uhs-i SD/SDHC/SD/extreme SD/Ultra II SD/ush-i SD/ush-i SD/ush-ii SD/MMC (mini SD/mini SDHC/rs-mmc/HS RS MMC may require an adapter)
-Micro SD (TF) slot: Micro SDXC/Micro SDHC/Micro SD/ush-i SD/ush-ii SD

System requirements
* Windows 8,7, Vista, XP
* Mac OS 9 and above
* Linux: releases based on modern kernels 2.x and 3.x with USB bulk storage support
* Android compatibility varies from device to device and is limited to devices running 4.0 and later to devices supporting USB Mass Storage.

Please note that
* SD/TF 4.0 card reader slot
* you can fully enjoy the transmission rates of current high-speed card formats: SDXC, Micro SDXC, uhs-i, ush-ii.
* not all CARDS support built-in security features.Check the compatibility details of the memory card manufacturer.
1.4 slots: SD/MMC * 2 + Micro SD/t-flash * 2, slot-supported SDXC Max 2TB, SDHC, SD, MMC, rs-mmc, Micro SDXC, Micro SD, Micro SDHC card and uhs-ii card are in full swing support ush-ii SD/Micro SD 4.0 card, Writer and Reader speed is 210mbs-250mbps
2. Built-in TF/SD card protection cover and read 2 different memory CARDS simultaneously – can be used as USB 3.0 flash drive and SD card reader simultaneously:
3. Plug and draw;USB power (no external power or battery is needed);Over speed USB 3.0 and compatible with 2.0/1.1.
4. Automatically detect memory card;Support SDXC up to 2TB/v1.0 / v1.1 / v2.0 / v3.0 (uhs-i) /v4.0 (uhs-ii) | SDHC | SDXC standard, the latest Micro SDXC and MMC 4.4.
5. Keep the LED status indicator light on when connecting, and flash when transmitting data.