This small, 5-watt LED desk lamp is a perfect lamp for the office, dorm room, bedroom, or any place where you need an adjustable brightness light. It uses 25 individual 4000 K neutral white LEDs, rated for 20,000 hours of use and arranged in a 5.5-inch ring, with frosted plastic to diffuse the light. This flicker-free bright table lamp features a stable 5 x 5.5-inch base with a touch control button that allows you to turn the light on or off with a mere touch. Holding the button continuously adjusts the brightness level up and down to a maximum of 400 lumens of brightness, while built-in memory remembers the last setting used when the light was powered off. The 17.7-inch flexible silicone neck allows you to position the light angle for the desired level and focus of illumination. The light is powered using a USB power source (not included) and features a 1200mAh rechargeable battery, which can provide up to 4 hours of operation on a 2-3 hour charge. A 59-inch USB Type-A to Micro Type-B cable is included.