Delivering a phenomenal 99 lumens per watt efficency, Mosso Pro changes light colors from warm to cool and anything in between. An intuitive built-in touchstrip allows for effortless continuous dimming. Built-in occupancy sensor ensures no energy is wasted lighting up a vacant desk. For smart phone enthusiasts, Mosso Pro comes standard with an USB port, or optionally a wireless charging base is available for recharging Qi-compatible mobile devices. With Mosso Pro, anything is possible. Made of Aluminum, plastic 48 LEDs LED Bulb s Total Wattage 5.5 Bulb s Included Voltage 100-240 V Number of Arms 2 Lumens 540 Max Brightness in footcandles measured 15 above desk for desk lamps 103 fc, 1108 lux Title 24 Touchstrip for continuous dimming on/off control Built-in occupancy sensor LEDs have a lifespan of 50,000 hours Tunable Light Color from 2700K to 5000K Built-in USB charging port comes standard with USB desk base Best of Neocon Gold Award 2013 Next Generation Luminaires €“ Winner 2014 Designer Peter Ng Style Modern Part of the Mosso Collection Some Assembly Required Safety Rating UL, CUL Warranty 5 Years Overall Dimensions 21.1 L x 18 W x 9 H Item Weight 4.85 lbs. Please note that this product is designed for use in the United States only 110 volt wiring , and may not work properly outside of the United States.