New filter options "Technology" and "Generation
There are two (common) technologies for night vision devices: residual light amplifier and IR illuminator. You should see this as a feature of each item and be able to filter by it. Then all night vision devices are divided into generations. (Gen 1 - Gen 3 [I would seriously not list 4]). These should also be set as a property for each night vision device and you should be able to filter by them.
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