This lamp is rechargeable, with up to 4 hours of light per charge. This uses Daylight's LED's with a three step dimmer. You can charge this with the internal rechargeable battery (included), the plug in power supply or a USB Cable. Ideal for needlework, quilting and reading. 7-7/8in x 9-3/4in x 3in, when open. 120 volts. Never change a lightbulb again! LED’s are designed to last 50,000 hours.