In the 5G era, the dream of the Internet of Everything is gradually becoming a reality. Many people are beginning to imagine the future life: smart home, autonomous driving, drone delivery... However, along with these new technologies come various security risks and challenges hidden behind the technology. In this context, jammers, as a technical means, have gradually entered the public eye.In some cases, signal jamming device can be regarded as "protective umbrellas". For example, in some meetings or sensitive occasions, the use of signal jammers can prevent eavesdropping or information leakage. Of course, this does not mean that it can be used at will. Whether it is for the purpose of maintaining privacy or protecting trade secrets, legal and compliant use is the key.When it comes to GPS jammers, we have to mention its special use in anti-surveillance and privacy protection. For those who want to protect their whereabouts, gps jammer can effectively prevent being tracked. But harassers, thieves, and other lawbreakers may use GPS jammers to cover up their behavior. Therefore, an ideal boundary needs to be found between protecting privacy and maintaining public safety.The popularity of drones has brought unprecedented convenience to our lives, but their existence has also caused a series of concerns. Drone jammers came into being and became a powerful assistant in protecting privacy and security. Jamming the jammer drone can block the signal of the drone, making it impossible to shoot or fly, thus protecting the personal domain from being violated.High power blocker have a wider range of applications and can interfere with multiple signals at the same time. This technology may be used as a protective measure in some special circumstances, such as military operations or terrorist activities.In summary, jammers have a positive role in protecting privacy and maintaining security, but there is also a risk of abuse. In this era of rapid technological development, let us look at jammers rationally, not only to play their protective role, but also to be vigilant about potential risks. In this way, we can better protect our safety and privacy while enjoying the convenience of technology.