Features: STEPLESS DIMMABLE: long press the button to adjust the brightness that is customized for you. USB PORT DESIGN: it’s powered by USB charger, USB power bank or laptop, so it is convenient when you want to use it. EYE-PROTECTIVE: high quality LED bulbs, 500 lumens, flicker-free and anti-glare light without strobes and radiation, it can keep your eyes away from exhaustion. CLAMP DESIGN AND FULLY-ADJUSTABLE: the clip range of adjustment screw clamp reach 6cm and strong bendy tub enables you to swivel the lamp flexibly and adjust the light position as you need. DESK PROTECTION: the rubber in the clamp helps to create friction with the desk, at the same time it prevents any damage from the desk surface. APPLICATION AREA: 6cm clip range make it can be used perfectly with music stands, bookshelves, office tables, computer desks, headboards, bicycle heads etc. PORTABLE AND ADJUSTABLE LIGHT: excellent for college and university students who needs small footprint lights for reading and studying or wants to bring it with yourself.Specifications: Light color: White Brightness: Stepless dimming Luminous flux: 500LM LED quantity: 24 pcs Input: DV 5V Power: Max.5W Color temperature: 5000K-5500K Lifespan: 35,000 hours Material: Aluminum alloy Item color: White Cable length: 160.0cm / 5.2ft Tube length: 25.0cm / 9.8in Lamp length: 27.5cm / 10.8in Clamp gap width: 6.0cm / 2.3in Item weight: 257.0g / 9.0oz Package size: 37.0 * 15.0 * 8.0cm / 14.5 * 5.9 * 3.1in(L * W * H) Package weight: 356.0g / 12.5ozPackage list: 1 * Clamp Light with USB Cable