As far as the night viewing distance: >200m. Field of view: 6.4 degree. Visibility regulating range: ±5℃. Under bright and dim light it shows color image while black and white image in darkness. OP-168 patent?a key pass?design, a switch to use very simple, convenient, gently rotating, can open the night-vision goggles, slowly rotating, easy to adjust the radiation light source device.
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