1. Small & portable - Can be taken it with a wallet. 2. 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. 3. Easily transfers content to/from your USB devices with a micro-SD card 4. Compatibility: Windows 7/8/8.1/10+, IOS, for Mac OS etc. 5. It allows you to easily add a USB 3.0 multi-slot card reader/writer to your USB 3.0 enabled system. Type: USB 3.0 micro-SD card usb adaptor color:Black Material:aluminum size:3 x 1.5 x 0.7cm Package Contents: 4 x usb 3.0 memory card reader Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.