Do not need external power supply, where there is no electrical outlet can also be used.When you unplug the USB device and computer requirements, do not unplug, turn off the switch. No USB power switch machines, don't have to unplug then you can just switch off.And USB machines located in the off state when not in use, can reduce the burden on computer and increase stability.To close USB usually do not use the machine, it is environmentally friendly.Each USB interface with the on/off switch 4 port USB hub.The USB interface switch comes with LED lights, on/off status at a glance. USB without using the machine located in the off State, can ease the burden on computer and increase stability. Normally unused USB machine can save electricity, are environmentally friendly. Energy-saving energy-saving with switch each USB connector the USB hub USB hub with a switch.Four-port USB HUB with separate switch 4-port HUB USB expansion port USB 2.0 Hi-speed ports black or white for laptop PC
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