The LED desk ring light with stand is powered by USB, making it easy to use with your computer, laptop, 5V2A adapter (not included), or portable power bank. The USB cable has a adjustable button control, allowing you to quickly turn on/off and adjust the brightness and color temperature easily. Whether you need bright cool white light for focused tasks or a soft warm tone for a relaxed ambiance, this adjustable small desk lamp has your covered with just a simple press