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 hoursPower:  Rechargeable lithium-ion battery, 3.7 V / 190 mAhCE, IP66,Class III3 dimming levels: low, mid, highBattery run time (h):  32 - 16 - 8