9 Different Options of Brightness Deaunbr reading light has soft light and bright light that you can choose, also each one that has 3 ways brightness. Through two touch controls: The "" button to change the intensity of the light (low, med, or high). The "M" button gives you the option of white light, warm light, or mixed. You will be able to use it in any situation you might think of. Rechargeable Battery with USB Interface Design Built In 1800mAh Rechargeable Battery, and Long Battery Life of 3 years. the reading lamp can be powered by USB charger, plug and play, notebook PC USB, Mobile phone adapter, Car usb and etc. You can use anytime, anywhere. Flexible Neck & Strong Clip The reading light has flexible neck, you can adjust it to any position. And the large clip is very strong and tight and will clip on the smallest of edges and stay put, and also clamp on to anything near you. Enjoy Your Night Time The book lamp is perfect for working, reading, study, camping, playing computer, crossing stitch. You can change a suitable color for night and not bother others in the home. The book light is perfect at home, hotel, office, on car, airplane, etc.