【Dual LED Light Source & 5 Brightness Levels】 The book light offers 3 color temperatures: warm (3000K), mixed (4500K), and pure white (6500K). Each mode has 5 adjustable brightness levels for a perfect lighting environment while reading. 【Optimal Brightness & Illumination】 With nine premium LED beads, this book light provides bright yet gentle illumination that protects your eyes. The 90° adjustable lamp (up/down + left/right) and 180° rotatable body ensure perfect light from all angles – ideal for evening reading! 【Eye-Friendly Reading Lamp】 Flicker-free, shadow-free, and glare-free lighting creates a natural and gentle lighting environment – even with prolonged use. 【Smart Timer Function】 By holding down the power button (after activation), you can choose between a 30-minute (green indicator) or 60-minute (blue indicator) timer. This energy-saving feature promotes better sleep and extends battery life. 【USB Rechargeable & Practical】 With a built-in 500 mAh rechargeable battery, this lamp provides 10-100 hours of continuous lighting and is easily charged via USB.