BAK4 prisms and multilayer green coating The binoculars use materials with an all optical multilayer broadband green film coating on BAK4 prisms. The multilayer green coating is transparent and bright, with a light transmittance of 99.8% and color saturation. The BAK4 prism design eliminates phase shift, providing light transmittance and clear imaging for longlasting performance. 20x50 Power Binoculars 20x magnification and a 50 mm objective lens deliver strong clarity and brightness. It provides a wider field of view at 1000 yards. Suitable for concerts, travel adventures, bird watching, concerts, hiking, watching wildlife and scenery. Environmental Protection Moistureproof Rubber Armor The binoculars feature a rubber armor coating and leather construction. The lens has an antifog coating to prevent moisture, dust, and debris from entering the binoculars, ensuring that it is waterproof and shockproof. Dual Focus Capability and Precise Adjustment Interpupillary distance can be adjusted to fit adults and kids. The precise central adjustment wheel allows easy focus on targets. For first use, the right eye diopter adjustment can be used to align the eyes for a clear view.