Lumagny 1.5x Illuminated Rimmed &lsquo;Biscuit Magnifier&rsquo; with 4x Diopter Inset Lens. Enhance your viewing power with distortion-free 1.5x power Lens 4X Power Diopter Lens Illuminate your reading or inspections with a built in LED. Button is 'press-to-light' and is off when released. Runs on one (1) CR2016 battery (included) "Credit Card" Size ( .4"H x 3.5"L x 2.125"W)