1. Night vision device is a precision optoelectronic instrument used to observe the target at night and in low light. In order to work under extremely low illumination, the night vision device is equipped with an infrared transmitter.

2. Night vision goggles cannot be turned on during the day without a protective cover. When checking the working performance of the night vision device in a room with light, it must be carried out when the night vision device is equipped with a mirror cover, and it should not exceed 3 minutes. And the night vision device should not deal with strong light sources, and it is possible for strong light to enter the interior of the night vision device. Damage it or reduce the life of the night vision device. Strong flashes should also be avoided when viewing objects with night vision goggles with mirror caps. When strong light enters the night vision device, its visibility will decrease or even disappear. At this time, the night vision device should be taken away from the strong light source immediately. After 1-2 minutes, the night vision function will resume. Extremely strong light sources can cause damage to the night vision device (eg 10 seconds during the day)

3. The night vision device allows strong flash and flicker within 1 minute. The light spot observed in the field of view is not a defect of the night vision device, but is caused by the flicker of an external light source. When the night vision device works in the standard way, there will be no light spots. The existence of a small number of black spots and bright spots in the field of view of the night vision device is not a quality defect, but meets the quality standards of the night vision device. Night vision goggles cannot be turned on during the day without a protective cover.

4. After the night vision device has been stored in a cold room or transported in winter, it must be kept in a warm room for 5 hours before being used again.

5. The night vision device is suitable for use at an ambient temperature of -30 degrees to 30 degrees, a relative humidity of 93% at a temperature of 25 degrees, and a local illumination of 5.10ˉ lux or below.

6. Night vision device working hours.

Do not turn on the infrared irradiator:

 --- When the temperature is higher than 0 degrees --- 20 hours

---When the temperature is minus 30 degrees---3.5 hours

To turn on the infrared irradiator:

--- When the temperature is higher than 0 degrees --- 16 hours

--- When the temperature is minus 30 degrees --- 2 hours

The battery must be placed in a warm place (such as a breast pocket) before the night vision goggles can be turned on below 10 degrees.

7. Night vision goggles should be kept in a clean place, protected from heavy pressure, mechanical damage, moisture, and solar radiation.