twilight.
In order to meet in a very low light intensity, night vision with infrared irradiation light source, turn on the power switch, you can adjust its brightness by switching.
OP-168 is a day and night of night vision comes with infrared the irradiated light source.
Under bright and dim light it shows color lmages while black and white image in darkness.
OP-168 own infrared irradiation light source device,according to the use of environmental condition can be forced open or close, and may, according to  the environment light brightness manual regulation to need the best condition.
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.