Product Shade material: plastic Lamp holder material: PVC Size: 41 x 4 x 2 cm (expanded size) Color: black Applicable type: PC (desktop, notebook, etc.) Each LED brightness parameter: 2000-4000CBD Package content: 1xLED clip eye protection lamp 1.USB or Battery Powered - The compact USB lamp adopts the USB interface, can also be used with 3 AAA batteriesNot included, and has an independent switch. Beautiful white light source. When you go online or play games at night, plug in such a USB cable to protect your eyes and prevent fatigue. 2.Handy Clamp - Clips to headboards, desks and tables to provide a stable light source wherever needed. 3 Brightness Settings Toggle between low, high and medium light as required. 3. Flexible gooseneck and stable base Bendable and rotatable gooseneck desgin to provide correct lighting height, light angle and more even light. 4.Long-life LED Life can reach more than 100,000 hours flexible metal bellows can be rotated in all directions, bend freely, adjust angle, and other fixing methods, flexible and convenient Small size, light weight, easy to carry, very easy to put in a briefcase or folder.