Why are signal jammers so afraid of not being able to block eavesdropping devices? from YIFALIU's blog

Technology is developing more and more rapidly. With the continuous emergence of high-tech products, eavesdropping devices are also being updated in large quantities, and various eavesdropping devices have also appeared. . In addition, with the development of AI voice technology, your voice can be recorded invisibly. At present, your reputation can be quickly copied in about 5 seconds. Who would have thought that it would counterfeit the content of your conversation to do a page of illegal things?

Turning a smartphone into an instant eavesdropping device, for many smartphone users, there is actually a zero-cost eavesdropping device built into the phone. In the "Settings" button of the smartphone, the smartphone is turned into a microphone and the captured sound is transmitted using Bluetooth. The privacy Bluetooth transmission function was originally prepared for friends with English hearing impairments, but from another perspective, it may be used as an eavesdropper by bad guys. The application of the privacy function is relatively simple and can be completed in 2 processes.

1. Enter the "Monitoring Center" in "Settings", find [Hearing System] in "Custom Control", and import it into the Monitoring Center.

2. Then connect the wireless Bluetooth headset to the iPhone; pull up to open the [Hearing System], and turn on [Real-time Listening]. At this moment, if you want to put the phone in the eavesdropping position, you can leave the surveillance. But with the privacy function, you can't go far, and the longest distance is only 15 meters. In other words, you can't hear it beyond 15 meters, and you can't record it. Therefore, if you see someone put the phone in your position, you can get a heart. The hidden eavesdropping tool in the movie and TV "Eavesdropping" Louis Koo used an unknown lighter to eavesdrop on key intelligence information. This special tool has been integrated into reality.

In a case published on the Judgment Documents Network in 2017, a small mobile phone headset was mentioned, which was very small and basically difficult for the human eye to detect. But he can answer calls, record, cheat, gamble, etc.

Zhang and Xu have a shop in Huaqiangbei, Shenzhen. One of them is responsible for production and processing, and the other is responsible for sales. It has to be admitted that the courage is really big to sell contraband items in an offline mall system with such a large flow of customers. In fact, for professional voyeur eavesdroppers, car remote controls, clothing buttons, lighters, pens, watches, and any daily necessities you can think of can be made into eavesdropping and voyeuristic tools.

A reporter secretly visited and found that there are some stores on Taobao that exaggerate and look like serious video recording equipment, but the reviews are "very good, you can hear the voices of the next door." Once you go online to find out, you will be reminded to add WeChat private chat and trade these eavesdropping products. Why are they so "nervous"? The answer is easy. Selling such tools is a violation of the criminal law. The sellers of the above-mentioned cases have all been imprisoned. But under the temptation of profit, they are still taking risks.

Huang He, the CEO of the signal jammer, personally admitted that he owed wages and was ready to take his sister-in-law away. When you confidently took the eavesdropping pen and wanted to sue to get your salary back, you found that the eavesdropping device was full of noise?

These problems do not have to be attributed to the fault of the eavesdropping pen. There is another possibility - the signal jammer for phone. For most people, the signal jammer may still be very unfamiliar, and many people may not know it at all. However, in business meetings, information confidentiality conferences, military negotiations and other information confidentiality scenarios, signal jammers have long been widely used. The most common signal jammer is to use "ultrasound" to prevent eavesdropping.

Ultrasound is a sound wave frequency that is transmitted at a frequency that the human ear cannot recognize. It has no harmful effect on human health, but it will cause a huge impact on every machine that uses a pickup microphone to record sound. For example, for some animals that are sensitive to low-frequency sounds, ultrasound is fatal, such as mice, snakes, mosquitoes and other animals. This is also a basic principle of ultrasonic electronic mosquito coils.