Describes the different technologies.

The second specification in a night vision device’s model number is the front lens diameter. The larger it is, the more light the night vision device collects.

Indicates whether it is a:
1. Binocular - for both eyes
2. Monocular - for one eye

Night vision devices can be equipped with additional functions.

The first number in the model number represents the magnification. It specifies how much larger an object appears compared to when viewed with the naked eye.

The range up to which the night vision device can be used in low-light conditions.