EYE PROTECTION - As we all know that most of electronic products such as mobile phone, computer and emit blue light which could gradually damaging eyes by hurting the retina. While the blue light of book accounts for just 0.05percent of light beam, so it can effectively protect the eyes from being damaged by blue light. Whats more, the could signal for the body to which induces sleep STURDY CLAMP AND FLEXIBLE NECK - The goose neck is flexible to be adjusted on the right direction you wish. Rubber pad on the clip protects or furniture against damages and offers and stable clamping. The book light can be clipped on headboards, laptop, books, , etc RECHARGEABLE LITHIUM BATTERY - The rechargeable book light has a built-in 1000mAh rechargeable battery with USB interface design. book light can be by USB charger, notebook PC USB, power , mobile phone adapter, car USB and etc,. The blue indicator will lights up when charging LIGHTWEIGHT and PORTABLE - This lightweight book light weights only 83g. This mini LED reading light is a perfect gift and a portable tool for camping and traveling. You can take it everywhere with and even pockets 7 and 3 BRIGHTNESS - The book light has 3 different brightness , the perfect brightness that keeps your eyes comfortable when working and reading just by clicking the button. You can enjoy your time when read in bed without disturbing your roomate Colour:black Material:ABS Size:24cm Package Contents: 1 x LED Light 1 x USB Cord Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.