Night Owl 5.0x Explorer Pro Night Vision Binoculars: * 524" field of view; 700" range of view * Built-in infrared illuminators for viewing in complete darkness * Steel stringer system for additional precision and control * Low battery indicator and extended infrared operation on low battery * Objective lens: 80mm focal length, 4-element glass construction * Ocular lens: 12mm focal length, 5-element glass construction * Spectral sensitivity: 400-900nm * Weight: 2.5 lbs. * Uses CR123A 3V lithium battery