Warm Light & Daylight -- There are 2 lighting modes for this kids reading book light. 4000K daylight and 3000K warm light. it can block 99.94% blue light. good for eye protection. Press the touching switch on the light head to change the modes. Brightness Dimmable -- The book reading light has 4 upgraded super bright LEDs. 25 Lumens. brightness can be adjusted from 100% to 10%. Hold the touching switch for seconds to adjust the brightness bright or dim. USB Rechargeable -- The built-in USB charging port of the clip book reading light can be charged by any universal USB interface like computer power bank or other USB charging port . the battery out put is 0.15W. 3.7V.200mA.Safe easy and convenient. Flexible Lighting Head -- The book lights led head can be rotated 90 anticlockwise. 180 clockwise. 45 downwards. the book light body can be rotated 350 .Perfectly meet all your lighting direction needs. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-dadangjia