Color Temperature and Stepless Dimming: Each lamp head has an independent switch; press and hold to adjust the brightness. Three color temperature modes: warm light (3000K), natural light (4500K), and cool white light (6000K). The reading light automatically adjusts to the color temperature and brightness setting used last time it was turned off. Rechargeable and Long-lasting: With the included USB cable, the reading light charges like a mobile phone, eliminating the need for batteries. The built-in 1000mAh battery provides up to 80 hours of use (depending on your neck light settings). This prevents daily charging and ensures uninterrupted light. Ergonomic Design: The neck light's design leaves your hands completely free, without straining your neck. Its ergonomic design and non-slip pad ensure the light rests comfortably against your neck, making it lightweight and comfortable to use even for extended periods. Uses advanced, glare-free LED light beads to maximize eye protection during reading. Long, Flexible Arms: The reading light features 360° flexible arms, allowing you to direct the light exactly where you need it. Choose the best light angle for different environments and easily create the perfect brightness for you. Weighing only 128g, this reading light takes up little space and can be easily folded into a backpack or bag. Friendly Companion: Each lamp head has an independent switch, so you can turn on just one side to illuminate the area where your husband or wife is sleeping. No more reading in bed at night disturbing others nearby. The perfect reading light for those who enjoy reading in bed. It's an excellent gift for your partner, children, parents, or friends.