Lovely stemUSB Table Lamp.15LED Lightsis brightEasy USB plug in and useAdjustable stainless steel neck can adjust to desirable angle for reading by thisUSB Desk LampPowered by USB Port or 3 pieces AAA batteries (batteries are not included)Color: As the picture showSize: about 30cm high, USB Table Lamp base dimension is 8.6 x 8.2 x 4.6cmUSB cable length: 1 meterWeight: 178gUsage:Connect the Black USB Lamp to the USB portable of your personal computer or your laptopSwitch the on/off button to turn off or turn on the USB Table LampIf you want to powered the Desk Lamp by AAA batteries, don’t connect the USB cable to the USB Lamp fristlyCut down the power if you won’t use the USB Desk Lamp for a long time