B21 are binoculars for professionals with high demandson image quality. Binocular configuration of the device implements high-quality stereoscopic images resulting in a higher range resolutionof 1,5x in comparison with monoculars or pseudo binoculars. The binoculars are produced with3x and 4x magnification. Lenses replacement is possible. The binoculars are equipped with automatic brightness control, light overload protection, an input for filling with dry air or nitrogen, „ON/OFF“ and low battery indicators, built-in infrared illuminator, convenientcontrolof operating modesbuttons, all-metal housing made of light alloy, the bracket to attach additional IR laser illuminator.