Signal jammer is a device that sends signals to the same frequency. If the jammer is turned on, the jamming part succeeds when the area of the mobile phone signal is disabled. Nowadays, with the increasing number of mobile users, some signal interference devices also appear to interfere with signals that disable specific environmental locations. It transmits on the same radio frequency as the mobile phone, interrupts the communication between the mobile phone and the base station in the tower, and refuses to provide radio signals to users in the coverage area of the interfering equipment.

At present, there are different types of signal jammers on the market. Some devices can only block a single frequency, while some devices can block multiple types of networks at the same time. The latter model can automatically switch from different networks to find open signals. Higher end devices can block all frequencies at the same time, while other devices can tune to specific frequencies. The carrier frequency of the transmitted EMI signal is the same as the carrier frequency, so the receiver and amplifier are demodulated at the receiving terminal at the same time. The collision between signals and interference signals, in short, the Signal Jammer sends signals in a wide frequency range, which is strong enough that the approaching equipment cannot be connected to its proper connection. Therefore, the device cannot make a regular connection. By quickly covering a series of frequencies, they can effectively prevent the normal operation of electronic devices.