MyBDJ QANLIIY 30X22 Pocket Size Portable HD Night Vision Binoculars Telescope(Black) Multi Coated optics guarantee superior light transmission and brightness This product has dual focus capability (Focus Wheel) Powerful, ultra-compact and ultra-lightweight Objective Lens: The diameter of the objective or front lens. The larger the objective lens, the more light that enters the binocular, and the brighter the image