The wavelength of it is 780mm.invisile to human naked eyes.seen by glimpse scope and infrared night viwer. used in the drill and actual combat,and identity places and equipments can't be expected to see. becoming a military necessity
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The wavelength of it is 780mm.invisile to human naked eyes.seen by glimpse scope and infrared night viwer. used in the drill and actual combat,and identity places and equipments can't be expected to see. becoming a military necessity
