"HIGH-LEVEL PRIVACY PROTECTION: Door peepholes can increase your privacy. Outside visitors cannot see your home from outside, providing you with high-level privacy protection and security . 200 DEGREES CLEAR ANGLE OF VISION: The optical glass lens can provide panoramic images and you can easily see the whole surrounding area from the top of the head to the feet of people outside. EASY TO INSTALL: Applicable door thickness: 35mm- 55mm, the security peephole is suitable for doors, wooden doors, security doors and fire doors, your belongings and ensures the safety of visitors behind the locked door. ADJUSTABLE INSIDE COVER - Simply close the cover when not in use to prevent outside strangers from spying on your home's layout, and you can open for identification notify when a stranger knocks on the door."