IPX grade 6 life waterproof: Lens cone sealed,the life waterproof of the mirror body effectively extends the service life of the waterproof mirror. multilayer broadband Green film: High light transmittance, effectively reducing the lightrefractive index imaging is clear, and transparent. ВAK4 high-transmittance prism: ВAK4 has a fine texture, which makes the imaging of the surrounding area more bright and clear. 28MM large eyepiece: The larger the , but the you enter, the clearer the small imaging can abundant details. 50MM Large Diameter: 50mm Large Diameter, Allow Light to Pass through Greater Imaging Clear and Bright, Lens Greater, Binoculars of Light, imaging Be More Bright.