SUPER CLEAR HD LENS220-degree high-quality wide-angle optical lens of the door viewer allows you to identify visitors or view the entire surrounding area without difficulty, providing you and your family with the highest level of security protection.BACK COVER FOR PRIVACYDesigned with a back cover, our spy hole can prevent outside visitors from seeing your home through the door viewer, increasing privacy. Threaded design keeps peephole firmly in the door, tamper-resistant, and tugging-resistant, giving you the highest level of privacy protection.EASY INSTALLATIONMade of solid brass, easy to install. Suitable for doors with a 1-3 / 8 to 2-1-6 thickness. Just need to drill a 9/16 diameter hole, insert the peep hole into the hole, then assemble the two parts of the door viewer according to the thread direction and tighten them by hand.WIDE APPLICATIONA necessary complement to any intercom system, security door monitor Modern design security door viewer is perfect for home, office, hotel and front doors where you need to see who is outside before opening your door, giving you more privacy and security.AFTER-SALES GUARANTEE1 year warranty. We constantly test and improve our door viewer to provide you with the absolute best quality at the best price. If you are not satisfied with your purchase, please feel free to contact us, we will provide you with the most intimate service.