[No need to disturb others reading] This clip-on book light has 4 brightness settings, emits a soft light, will not hurt or strain your eyes, and also allows you to read without awakening the outside. Just press the on/off button to make adjustments asneeded. [Perfect book light for reading in bed] The warm LED light provides a comfortable reading experience on the bed. The 360-degree flexible body, adjustable angle, and curved arm make it very easy to adjust according to your preferences. [30 minutes USB charging time] No additional cables are required, just plug into the USB port of any charging device. It only takes 30 minutes to fully charge. The best gift for friends and parents who like to read. Continuous working 4 hoursContinuous working 4 hours. Meet your needs for any occasion. Suitable for clip on Kindle, paperback and ordinary books. [You can carry it with you] Its weight is equivalent to a tablespoon. It is small, light and portable, so you can carry it with you. Made in the shape of a bookmark, use this LED reading light as a bookmark so you won't miss your page.