The light source of the LED desk lamp adopts high quality LEDs (CE ROHS certified) 3 lighting modes and infinite dimmable: cool white / warm white / natural white ----- with 3 color temperatures and 10 levels, ourLED clip lights cover all possible uses whether you are relaxing, sleeping, reading, cooking or working. You can adjust the brightness from 80 to 800 lumens (10% to 100%) in any light mode. With USB Power Cable: You can connect the clamp desk lamp to USB port, DC outlet (5V, 2A output), power bank or laptop etc. If you use them with a power bank, you cantake this handy clamp lamp with you. Unique Clip Design: The reading light is made of high quality aluminum alloy with anti-rust surface treatment, solid and durable. Strong clamping force, can be fixed on any 6cm thick panel, suchas a desk, a headboard, etc. Unique architectural design. Flexible metal arm: flexible metal gooseneck (17.2 inches), the flexible metal neck can be rotated, so you can adjust the lighting angle at will no matter where it is placed. Eye protection: The lamps can be adjusted to obtain the best lighting angle. The lamp holder is made of aluminum, which has good heat dissipation, uniform luminous efficiency, no glare, flicker and glare.The eyes do not get tired even after prolonged exposure to light. Protect your eyes when reading, drawing, working, studying.