Note: The video of our store is for demonstration, and the products in the video are upgraded models of the products sold! The plug-in long press can adjust the brightness, but it does not have three-level dimming. The rechargeable type has three-level dimming function, but does not have long press dimming. Product name: LED touch desk lamp Battery: lithium battery Product Color: White Voltage: 5V LED power: 8W Package : 1* USB cable, 1* LED Table Lamp Version USB Plug-in : Use USB cable as power cable ,it means you need to connect the USB cable when use it . If disconnect the USB cable,it will not work (one free USB cable in the package) USB rechargeable : There is one 1200MAH built-in battery in the lamp. It means you can use USB cable as power supply , and also you can use it without USB cable when the lamp is fully charged. (also one free USB cable in the package)