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All of them have tiny hidden cameras while some can be operated using a phone

Walk-through metal detectors are typically installed at indoor checkpoints to detect illicit material and contraband. Outdoor walk-through metal detectors are designed for temporary outdoor use and are widely used at special event checkpoints, such as concerts or sporting events.

A stun gun is a portable safety device you can use to protect yourself by "stunning" or "jolting" a would-be assailant. Stun guns disable a person by delivering a temporary, high-voltage electric shock.

Spy camera that has a rechargeable battery that lasts for 8-9 hrs, it is connected to a smartphone through WiFi, mainly built for indoor use.

Automated keylocks that has facial recognition, fingerprint, swipe card,manual key, remote as a means of operation and it can also be operated using a smart phone connected through WIFI

Used as a self defense

Used by hand to detect metallic objects

Used as a self defense against long range threats

Spy glasses have cameras with memory spaces built in them while Bodyguard Google enables for both front and back views.