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DN Night Vision Monocular is a night observation device．It can be used for night observation and night operation，such as observing wildings at night, safeguarding of farms，villas，factories-mines at night. It can be used for entertainments at night too．And it's small enough to fit in the palm of your hand, pocket or backpack. Image intensifier tube classification Gen 1+ Magnification 3x Lens diameter *2mm Field of view *3º Resolution *0lp/mm Focus range 1 yard to inf. Eye relief *0mm Diopter adjustment ± 1.5 Detection distance up to **0 yards (approx.) Power supply 3V (CR **3A) Estimated battery life (w/out IR) up to *0 hours (approx.) Operating temperature **2°F to ***0°F Dimensions 6.9” (L) x 3”(W) x 2.5” (H) inch Weight *1oz gracewalch yahoo com