Magnifier Material: plastic case Inner diameter: 58-64MM Outer diameter: 100MM Input voltage: 110V - 240V Power consumption: 4.5W Working distance: 60--180mm Light source for diameter: 63mm 58mm Protection circuit: current limit, constant power and over temperature protection. Product dimensions are measured by physical objects. Due to the different measurement methods, an error of 1-2 mm occurs. The relevant data is for reference only and depends on the actual object. Wide range of uses, maintenance, reading, scientific observation, jewelry appraisal