ErgoAm is a refractive loupe that use lenses to refract, or bend, light in order to create a magnified image of an object being viewed. The advanced optics allows you to keep your head completely upright while working which reduces strain especially during long procedures. Try it out during the demo to see if its the right loupe for you. ErgoAm comes in 3.5x, 4.0x, 5.0x and 6.0x magnification. New Wireless LED light provides powerful and round focus white light, touchable power switch and brightness adjustment, easy one-handed operating. Total only 29.8 gram (light and battery), most comfortable user experience Three batteries provide energy for a day’s work. Headlight Weight: 10gm Brightness: 35,000 Lux Light Colour Temperature: 5800 Battery Type: Lithium Ion Weight: 20gm Recharge Time: 1.5 hr Run Time: 140 min