4 port USB hub is used to charge multiple devices simultaneously just by plugging in the USB cable. It makes desktop extension easier and it is compatible with most of the USB devices such as flash drive, hard drive, keyboard, mouse, radiator, card reader, USB fan, etc. It has a micro USB power supply interface that is easy to drive multi high-power devices and it can be carried to any destination. It has an LED indicator lamp to be clear of real-time working status. It has the free drive with windows, Mac, Linus Operating system.