DESC: Instant and constant focus for immediate usage. The Night Owl Explorer Fixed Focus Binoculars feature premium performance in an attractive rubberized finish for robust, extra comfortable handling. These binoculars have two Electronic Intensifier Tubes (EIT) for extra clarity and viewing pleasure cradled inside Night Owl Optics unique Steel Stringer System for precision and control. These binoculars also feature our built-in infrared illuminator which provides clear and bright viewing in complete darkness.