1.On-off switch: put the lamp flatwise on the table and switch to “ON” ,then power-on. At this time, touch the “”icon in the front of the lamp, short touch to turn the lamp on and short touch again to turn the lamp off. 2.Brightness adjusting : when the lamp is on, you can touch the “ “ icon long to change the brightness. 3.Charging: you can connect the USB to the computer output port , and supply power to lamp by inserting to 3.5DC port. 4.Status indicator light: insert the 3.5mm DC port into lamp charging port, then the red charging indicator light will keep on. When the charging is completed, the red charging indicator light will off ,while the red charging indicator light will keep on.