• Features 3 color temperatures (Warm Yellow, White, Warm White), satisfying different light needs in daily life
• USB rechargeable, easily charge by computer or laptop
• Provides sufficient light in low light areas when reading or working without disturbing roommates
• Color temperature and brightness levels are adjustable, so you can freely choose the perfect color and brightness that keeps your eyes comfortable
• With clamp design, easy to clip on your book, convenient to use
• Easy to having these ultra portable USB light around, just plug into USB ports on your laptop, computer, etc

Specification:

• Maximum brightness: 50 lumens
• Color temperature: 3000K/5500K/4500K
• Battery capacity: 250mAh 
• Working time (fully charged): about 3 hours
• Charging time: about 40 minutes