It uses 42mm fully multi-coated green film objective lens, fully multi-coated blue film eyepiece and large smart phrase BAK4 prism, which can ensure the key elements of optical equipment, make your vision brighter, clearer and provide clear image.The compact top prism model strikes a balance between small size and high-quality image quality, 10x power magnification and 307ft/1000yds wide field of view are very suitable for outdoor activities, such as climbing, hiking, driving, watching wildlife and scenery.The front has a 4.1/4" -20 thread. You can use a binocular adapter to connect it to a tripod, which is small in size, light in weight and easy to carry. Item size: 5.51" x 6.30" x 2.17". Weight: 23.88 ouncesSturdy structure-The sturdy frame and rubber armor make it can withstand the harshest weather conditions. It can be used with or without glasses-The adjustable eye cup can be rotated up and down, whether with or without glasses, it is comfortable to watch.Capture the beauty in the distant world and share it with your friends and family. Many times we want to record the beauty of the distance. But long-distance camera lenses are always bulky and expensive. For this reason, we designed this smart phone adapter. It is compact in structure, light in weight and very easy to operate.