Adjustable Brightness & Color: There are 4 lighting modes of the reading lamp: Bright/dim white and bright/dim yellow. Desk lamp meets your needs of daily reading, office, kids studying webcam lighting and other scenes. Flexible & Perdurable: The 15in gooseneck of reading light can be rotated 360° to provide flexible lighting. The clip is attached with foam cotton, protecting your furniture from scratch. The width max of clamp is 2.3inch. Eye-Caring Reading Lights for Books in Bed: Made of 36 LED lamp beads, the lighting of clip on light does not flicker. You can clip the led ring light on bed headboard, computer, desk, piano, etc. USB Powered: Coming with 59inch USB wire, the clamp light is convenient to connect with computer, AC adapter or power bank (AC adapter NOT INCLUDED). Note: This bed lamp not powered by electric wall plug. Energy-Saving ring light: The clamp lamp has a wider lighting range and higher brightness than the small book light. LED light source is in higher performance and has longer service life. Eye-Caring and Energy-Saving. With high quality LEDs, the clip lamp with high brightness can cover larger area. Soft, comfortable and non-flickering, friendly to your eyes. LED light source, most of electricity converted to light and have long service life as well as good lighting effect.