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How to Install a door viewer for home safety

Person using a power drill on a wooden door.

Just because a person is cordial enough to knock at your door doesn't mean that he isn't a conman or burglar out to knock you out and steal all your belongings. So you can probably understand the usefulness of a spy hole, or a door viewer.

A door viewer allows you to look at the person knocking or ringing your doorbell first before opening the door. Check out this video to learn how to install a door viewer.

This video shows how to quickly install a door viewer (often called a spy hole) into a solid wood door.

Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check Gadget Hacks' list of supported iPhone and iPad models, then follow the step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.

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