This usb interface is not used for data transmission, and the usb charging function of the mobile phone is the same, the usb interface on the desk lamp is used for charging. Now the product design is multi-functional, practical, if the lamp is a standard size usb interface, then it is the mobile phone charging head function, connect the data line to the mobile phone, you can charge the usb device.
If it is a micro mini usb interface, there is a rechargeable battery inside the desk lamp, and it can be charged by an external usb charging head.
usb power supply is enough, which is convenient and energy saving.