Powered via USB, the lightweight and compact design makes it easy to carry in a laptop bag, backpack, purse, or suitcase and doesn't take up precious desktop space. Each port has a switch, you can switch off to plug and play to avoid hot swap or pull off Type C port frequently.  Compatible with: Windows XP / Vista / 7 / 8:Microsoft Surface, Sony Vaio, Dell Inspiron, Lenovo ThinkPad, Acer Chromebook, ViewSonic gTablet, Asus EEE Slate, Asus EEE Pad Transformer, Asus EEE Pad Slider, Apple New 12 inch Retina MacBook, Google ChromeBook Pixel and more. What is included:1 x USB 3.1 to USB 3.0 4-Ports HUD 

• Ports: 4 x USB 3.0 type-A ports
• Data Transfer Rate: USB 3.0 - Up to 5 Gbps, USB 2.0 - Up to 480 Mbps
• Power Source: Bus powered
• System Requirements: Available USB port, Windows XP / Vista / 7 / 8, Mac OS X
• Dimensions (WxHxD): 2.0 x 2.0 x 3.7" (5.0 x 5.0 x 9.5 cm)
• Weight: 6 oz (171 g)