Oupuoptic instrument co.,ltd is an door viewer and laser cross instrument manufactory in Beijing of china.was founded in 2001, which is located in Tongzhou District of Beijing. We have advanced technologies and equipment, hardworking and ambitious managers, technicians with innovative spirit as well as skillful production workers. We have created a series of high-quality products based on scientific management and the enterprising spirit of ceaseless pursuit of brilliant and perfect products. There are five series of products now we can offer.1. Door Viewer Series 2. Laser Cross Series 1) LC10 Laser Cross: 2) LC05 Laser Cross;3) LC03 LaserCross