Ultra thin and durable high-quality aluminum material No longer need to twist the cable to reach the port vertically. Now, you can easily access USB ports and an additional 2 slot card readers from an ergonomic perspective! It does not require any software or complex installation process. Adopting a slim design, it saves you valuable desktop space. Please note: It is designed specifically for the iMacs released between 2012 and 2019. (21 inches/27 inches/5K) Add three USB 3.0 ports and SD/TF card readers to the computer Supports SD, SDCC (up to 2TB), SDHC, Micro-SD, Micro-SDCC, Micro-SDHC card The blue LED indicator light displays the power status Save synchronization time, data transmission rate up to 5 Gbps Backward compatibility with USB 2.0 and 1.1 specifications. system requirements:for Mac OS X 10.6 and higher versions;for Windows 98SE / ME / 2000 / XP / Vista / 7/8/10;for Linux 2.4 or higher version Colour:Silver Material:Aluminum Alloy Package Contents: 1 x USB 3.0 HUB(Due to different product batches, the appearance may vary, which does not affect the use) 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.