[200° Wide Viewing Angle] Experience unparalleled visibility with our 200-degree wide-angle peephole, allowing you to clearly identify visitors from head to toe while remaining completely secure behind your locked door. The advanced optical design provides a crisp view of your entire doorway, ensuring you never miss a detail of who's outside. [5-Minute Tool-Free Installation] Enhance your door security in minutes with our easy installation that requires no special tools or technical expertise. Simply follow the clear instructions to replace your old peephole or install this new viewer and enjoy increased security without the need for professional help. [Universal Door Compatibility] Designed to fit most standard doors with a thickness ranging from 35mm to 60mm, this versatile peephole works perfectly on security doors, fire doors, and other types of doors. Durable construction ensures reliable performance at any entry point, whether it's the front door, an apartment door, or an office door. [Burglar Security Lens] Our premium resin lenses are designed to prevent reverse viewing, stopping intruders from looking in while giving you a clear view out. This anti-spy technology creates an effective barrier against potential burglaries and unwanted intrusions, giving you peace of mind at home. [Heavy-Duty Privacy Cover] The solid zinc alloy peephole cover offers maximum privacy by completely blocking the view when activated. When closed, the cover prevents anyone outside from seeing through, while its smooth operation and sleek design perfectly complement the look of your door.