For close-up precision and inspection work. Plano-convex glass magnifier Lens, diameter 6.75cm (2 2/3") Magnification 3x (7.5 dioptre), 3 White LED bulbs switch on/off by pressing Dome Base diameter: 9.3cm (3 2/3"),height to top of Lens: 4.6cm (1¾"), weight: 146G,Voltage: 3V per battery (2x CR2016) Capacity: 75mah(232°,15Ko from 3V to 2V) & working current: 0.2mA Fitted with 2x CR2016 limn batteries - remove pull tab to activate., Weight: 0.330693393 Pounds, Manufacturer: Shesto Ltd