Master artisans have hand-cut and polished every surface of the Xtal’s crystal glass shade.‎ It is this superior level of craftsmanship that allows the lamp to produce its signature tapestry of light—an ethereal radial flare—and icy glimmer.‎Glass shade : Crystal glassLED - 2000KUSB Charge: Approx.‎ 3 hours Power: Rechargeable lithium-ion battery, 3.‎‎7 V / 190 mAhCE, IP66,Class III3 dimming levels: low, mid, highBattery run time (h): 32 - 16 - 8