16X40 HD Compact Porro Prism Day Night Vision Binoculars Telescope 16X magnification, auto focusing porro prism 35mm-Millimeter lens diameter 1 x monocular 1 x cleaning cloth 1 x pouch 1 x Manual 1 x Sling Product size: 188*150*40mm Telescope is pure optical instruments, so it is ok to use in the evening , but if the target is under the condition of black and no light environment, we can not see anything. Because the telescope is LLL night vision, its characteristic is by external light( such as lamplight/concert/street lamp/neon light/fireworks etc.) to see the target more clearly .