3 Lighting Modes for Your Choice: Mixed Color -Press the power button on the back once; Color Yellow -Press the power button on the back twice; Color White -Press the power button on the back three times; -Press four times to turn off the lamp. How to Adjust the Brightness Intensity of This Lamp? -Press the power button on the back of this lamp once to open and you have already chosen the suitable lighting mode and then long press (about 4-5 seconds) to adjust brightness intensity at your request Tips for use: 1.When you charge this reading light and it does not charge and please check if you plug in the correct USB connector with mains socket; 2.When you are not using this reading light, please charge it every 20 days for longer life of the built-in battery of this light. Charging Time: 30-40 minutes to fully charge this lamp; Working Time: About 3 hours in high brightness once fully charged; About 10-15 hours in low light once fully charged; Lamp usage time depends on the brightness of the lamp when in use. Reading Lamp for Reading in Bed, Book Reading Lamp, 3 Color Temperature-Adjustable Brightness Intensity, Light for Reading at Night, Reading Lamp for Book, Kindle, Ebook Permanent link: Have you found a lower price? Tell us. We cannot match every price listed, but we will use your ideas to ensure our prices are competitive. USB Interface Well Suit Your Demand Fits Your Book or E-book Well Mini Clip Lamp Well Meets Your Demand < /h3> lighting with Computer lighting with Book in the Night lighting with E-book in the Night lighting as a night light for your child Technical descriptionAdditional information Return policy Your opinion < /h1>Retailer Website (Online)Retailer Store (Offline)