21 mm Extra Large Eyepiece, More Detail, Clearer and BrighterEquipped with an oversized 21 mm eyepiece, this handheld monocular offers you a comfortable viewing experience. Including the BAK4 prism, all the lenses are fully multi-layer coated to reduce light loss by 99.99%, providing you with a brighter picture.LIFE-WATERPROOF, FOGPROOF, DUST-PROOF, SHOCKPROOFNitrogen-filled waterproof, This monocular built in lens dust cover can prevent lens from dust/moisture/debris, make sure you see everything in a clear detail. Its rubber finish has shock resistance, durable external protection makes it usable to withstand the tough weather conditionsWide Compatibility1Non-limited for glasses-wearer.The design of this monocular allows the wearer to get close to the eyepiece without interfering with the viewing experience and feel more comfortable.2.Equipped with a mobile phone bracket, which is suitable for many types of smart phones on the market. 3.Both adults and children can use it.Great GiftThis monocular has a wide range of uses and strong compatibility, Can be used by adults, elderly, and children. It's the ideal gift for men for Father's Day and Christmas, It is also a good choice for birthdays and Mother's Day. Share the world in your eyes with your family and friends