Color Modes: This reading light has 3 brightness levels: warm (3000K), warm white (4000K), and cool white (6000K). The neck light has stepless dimming for each arm, allowing you to use different light settings to suit your needs: warm light for bedtime reading; warm white light for studying; and cool white light for knitting, crafts, precision sewing, or crocheting. Eye-Caring Reading Lamp: Our book light features a large, rotating LED panel similar to a desk lamp, providing even and soft illumination. There is no flicker, shadows, or glare from our neck light, which helps you avoid eye strain and fatigue. Choose our LED reading light for book lovers or avid readers, for comfortable and enjoyable reading. Rechargeable, Adjustable, Dimmable, Memory: The built-in 2000 mAh battery provides up to 80 hours of working time (depending on your light settings). Choose from 3 color temperatures (warm, warm white, cool white) by clicking the power button or press and hold the button to continuously adjust the brightness. The memory function provides instant access to your last personalized setting after turning on the light.