Aenmil Dual Focus Monocular Telescope 10-100x21 Telescope Powerful and ultra-lightweight Monocular Telescopic 66M/8000M for Outdoor Travel/hunting/camping/hiking Armoring Multi Coated optics guarantee superior light transmission and brightness This product have dual focus capability (front and back adjustable zoom) Powerful, ultra-compact and ultra-lightweight, Single hand operation easy focusing Suitable for Golf, Camping, Hiking, Fishing, Bird watching, Concerts, etc. Note: It's Faint light Night Vision telescope,need light. Cannot be used in all the dark environment.