The 20-140x80 Gladiator Binoculars feature BAK-4 prisms, which deliver sharper and brighter images. The wide range of zoom magnification adjustments are ideal for astronomy and long-distance land viewing. The wide variable magnification range of these binoculars allows the viewer to target an object and then zoom in and magnify it to obtain a closer look and see greater detail. Simply adjust the thumb lever to switch from different magnification levels, making it smooth and quick. Features include beautiful green lenses, stunning multi-coated optics and large objective lens, which means increased light transmission and translates into greater detail and image clarity. These binoculars are ideal for all outdoor activities and sporting events.