door viewer
Who's there? lens
A door viewer is a small optical device installed in a door, allowing someone inside to see who is outside without opening it.
The lens—typically a wide-angle peephole—shows a fish-eye view of the area beyond: She checked the door viewer before answering.
Also called a peephole or spyhole.
- peepholeDoor-mounted viewing lens
- spy holeDoor's viewing aperture
- lensLight-focusing curved glass
- wide angle lensOptic capturing broad fields
- securityProtection from threat
home security · safety feature · visitor · knock · eye level · fisheye · brass · glass · apartment · privacy · stranger · chain · lock · distorted · wide-angle · installation · hole · peek
surveillance technology
door viewervideo doorbell
Camera-equipped entrance alert
doorbell camera · smart doorbell · video intercom · surveillance camera · intercom system
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