A sleek, contemporary design, this LED Desk Lamp supports wellness by syncing your indoor home office lighting up with your circadian rhythm. A simple push switch on the base allows full control over 3 different color temperature modes and full range of brightness settings offering an infinite amount of lighting selections. Simply push & hold the switch in order to dim/brighten. Push and release the switch to change color temperature. By adjusting your lamps color temperature throughout the day you can simulate the natural progression of the sun, helping to regulate the body's internal clock to improve sleep habits and overall personal health. A cooler color temperature during the day will keep you alert and active while a warm, dim glow at night will ease you right into a good nights rest. The LED lights are integrated into the lamp and are not replaceable, but last 50,000 hours. A USB is located on the base as well offering a convenient solution to charge up your smart devices while working. All lighting product is either UL or ETL listed, meaning that it has been tested and approved to meet the government-regulated safety standards for the USA.