UniFire Adjustable Rechargeable USB LED Desk lamp, White Fashionable design with good performance,Your fashion partner. Touch Sensor Switch is applied to this lamp,and if has 3-Levels of different Brightness: single touch gives lowest brightness,double touches medium and three touches the strongest. Adjustable brightness can meet various demands of different environments. After fully charged,the lamp will last 12 hours consecutively in the dimmest light; 8 hours in medium light and 5 hours in brightest. The batteries are discharged when lamp is dimming. Please stop using the lamp, and recharge it in time, lest it damage the performance of the batteries and reduce its lifetime. Maintenance:Please charge the lamp over 8 hours before initial use. It takes 12 hours to reach a full charge. If this lamp is not used for a long time, please change it at least once in two months (over 8 hours) to protect the battery from aging.