Night vision binoculars BN-1 Soviet Russian USSR. Made in USSR in 1980-s. BN-1 (1PN33B) – this is another version of the Baigish-12 gen. 1 night vision device. 1PN33B – is the name of the model, and BN-1 is the military designation. Power supply: original charger for 12V or 27V and efficient battery 7D-0,115-U1.1 (1 item). Magnification: 3.2 x. Viewing angle: 9 °. Distance of view: 500 m. The distance of the human recognition on the greenery: 200 m. Distance of the eye from the eyepiece: 20 mm. Diopter adjustment range: /- 4. Temperature range: -40 ° C… Range of eyeglass adjustment: 62-72 mm. Dimensions of the night vision device: 242? 178? 84 mm. Dimensions of the cover: 283? 215? 126 mm. Power supply: 9V battery (7? -0,115-? 1.1). Power consumption during operation. Working time at 20 ° C: 7 hours. Working time at -40 ° C: 3 hours.