Switch method: touch
Brightness: touch three-level stepless dimming
Color: white light / warm light / warm white light
1.USB Plug in : no battery, When using the desk lamp, you need to connect the usb cable to the plug all the time.
2.USB Rechargeable:There is a rechargeable battery, the lamp can be charged with a USB cable, and it can be used wirelessly after being fully charged. It can also be used by plugging in the USB cable