Description Magnification: 4x | Objective Lens Diameter: 10mm | Prism Type: BK-7 | Ultra Compact and Lightweight Fully Coated Lenses | Eye Relief: 13mm | Field of View: 525 feet at 1,000 yards Weight: 2.2 ounces | Product Dimensions: 3.5 inch x 0.5 inch x 2.0 inch | Center Focus Knob for Maximum Focusing Flexibility Included Accessories: Pouch, Neck Strap and Lens Cloth | Perfect for the opera, theater, sporting events or concerts Backed by Ade's life time no fault warranty. Ade is an Oregon company Ade Advanced Optics WT090410 Concert View is a 4x10mm Ultra-Compact Binocular that is so portable that you can take it with you anywhere. The size is about 19 mm in thickness and 1.6oz in weight. It comes with center focus knob for maximum focusing flexibility with fully coated lenses. Perfect for bring to sports, theater, opera and concerts. At Ade Advanced Optics, we manufacture only the best quality optics. We're very confident in our products that we back them with a Life time warranty (USA only). In the event that your binoculars get damaged, regardless of cause, Ade Advanced Optics will repair or replace them for a total cost of $10.00, which includes all return shipping and handling fees. If your binoculars are found to have manufacturing defects in materials or workmanship within first 30 days of use, Ade Advanced Optics will repair or replace your binoculars and return them FREE OF CHARGE. We ship all items within 1 business day. No international shipping. About Ade Advanced Optics Ade Advanced Optics first made its appearance in the firearms accessory industry by doing private label production for several major manufacturers and retailers. During this period, Ade Advanced Optics began receiving requests from numerous customers for access to the affordable, high quality products that Ade Advanced Optics was capable of producing. By soliciting feedback from both clients and end users, Ade Advanced Optics was able to overcome the challenges a new company often faces when entering a global market and industry, especially one as competitive as the shooting, hunting, and outdoors industry. Payments are accepted through Paypal. 30 days easy return. No restocking fee on like new condition item. Please use the "Ask Seller A Question" button. Please allow up to 24 hours for a response. Usually the buyer will get response in 6 hours.