Opera Binoculars Theater Glasses BinocularBeautiful design and durability built to last3X magnification for indoor viewing, Specially suitable for theaterIt is a perfect Birthday Christmas Halloween Thanksgiving Day GiftsManufactured by NAUTICALMART INC Brass Opera Binocular Nautical Marine Binocular Glasses Binocular Binocular with Handle Nautical Collectibles The application of the Opera glass is very widely such as visiting horse and car races,going to the circus, watching sports meeting,or enjoying opera and so on. Optical glass lens make the image clearer and wider field of view than other ordinary lens.It also has optical focus function. You can use focusing wheel until the image becomes clear.