Features: Easy to carry: These USB lamps are lightweight and small, so you can carry them to most places you want, suitable for business trip. Flexible gooseneck: The arm of USB reading light can be 360 degree adjusted, easy to meet the good lighting angle. Eye Protection: Larger light emitting area, better heat dissipation, provides soft eye care light source, no-flicker, anti glare light without ghosting to relieve eye fatigue. Portable: Weighing only 1 ounce, this LED light is light in weight and compact in size, which can be stored in your bag for portability, suitable for home, classroom, office and travel. Specifications: Size: 440 x 24 x 20 mm/ 17.3 x 1 x 0.8 inch Color: as pictures shown Material: Silicone, ABS Power input: DC 5V 500MA USB Port Work rate: 2.8 w Operating temperature: -10 degrees Celsius-50 degrees Celsius Package include: 4 x USB Reading Lamp