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A periscope is an optical instrument with mirrors or prisms, allowing observation over, around, or through obstacles by reflecting light.
Modern public CCTV camera on the wall. cameras record for monitoring activities throughout the day and night. Supervision and monitoring concept.
Mature male security guard in uniform and cap lighting forward with flashlight while moving along corridor of old building
Female hand holding black mobile smart phone with smart home application on the screen. Blurred house on the background. For access to all of the controls of your house and caring of home security
Cute kids exploring nature and observing insects with nets, magnifying glasses, and binoculars. Perfect for summer camp and outdoor education themes.

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