If you’ve ever been in the awkward situation of heaving to hear somebody else’s phone conversation because that person is screaming to his/her cellphone, than you probably dreamed of this gadget.

The Portable Universal Cell Phone Jammer (as its name suggests) is a device created to block cellphone signal reception (up to 30 feet radius), thus ending annoying conversations. So far, so good. But what if someone is expecting an important call, or an emergency happens? Imagine a thief or a criminal having a phone jammer. The victim’s efforts of calling for help are usless. That’s why these gadgets are illegal in most countries and it’s not a good idea to use them in public spaces, no matter how annoying some people are.

The device in the picture can be purcahsed for about US $170.

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