... .The head can be changed by light or fan 2.Neck by flexible metal tube 3.Power by USB,energy save dual use ... supply needed,no drivers or installations required3.Power supply:5VDC directly from the USB port4.Compatible with PCs, notebooks,and PDAs5.Gently ... soft nylon fan blades,provides cool air while working7.Light by power saving design, and comes with reliable LED light dual ...