?? ?4-Port Hub Expansion Function? This product is intended for use with bus supplies that do not require a power adapter. Plug and play, no installation needed, hot swap. ?? ?5 Gbps high-speed data transfer? With 4 * USB 3.0 ports, reaching a maximum transfer speed of 5 Gbps, HD movies can be transferred in seconds. Ten times faster than USB 2.0, it is also compatible with USB 2.0 / 1.1. ?? ?Single on / off switch? USB hub 3.0 with 4 ports, single on / off switch is installed for each port without taking off the device. ?? ?Wide compatibility? It supports multiple systems such as for MacBook Air, Laptop, iMac,PC, USB Flash Drives, Hard Drive ?? ?Super slim and lightweight? The size of the main body is small, it is easy to carry around. Size: 12.7cm * 4.5cm * 1.5cm, Weight: 42g, 24 months warranty.