Cell phone signal jammers are used in many places, such as school exams, prisons, hospitals, etc., but the choice of shielding devices is also very particular. Do you know how to choose a shielding device?

Many people know the shielding device but don't know its working principle. They just think that it is amazing that it can make the mobile phone lose signal in an instant. Then we can take a look at the working principle of the shielding device. The mobile phone has a signal because the electromagnetic wave emitted by the signal tower is received by the electromagnetic wave of the mobile phone, and then there is a signal. The function of the shielding device is that it emits an electromagnetic wave whose wavelength is between long wave and short wave. Interfering with the reception of the electromagnetic wave of the base station by the mobile phone, the information received by the mobile phone is garbled, so the mobile phone cannot receive the message normally, and the words such as no service are displayed, which achieves the function of shielding the signal.

A good shielding device should be green and environmentally friendly, and the electromagnetic field strength is lower than the national standard, which is harmless to the human body; and it only shields the mobile phone signals in the test room, without any impact on the mobile phone outside the test room, and will not cause interference to the signal tower.

GPS monitoring equipment is mainly used for real-time location tracking, which is used to monitor property and loved ones. Over the years, monitoring equipment has been used for legal tasks, including rescue missions, monitoring sex offenders or monitoring parole offenders. Among other things, it can be used to locate and protect fleets. The device helps fleet managers protect their vehicles and guarantee quick recovery in the event of their belongings being stolen, giving companies the opportunity to earn lower insurance premiums. In fact, these tracking devices have been used to track the whereabouts of spouses in order to understand potential cheating.

GPS jammers are primarily sold online. Plug it into the 12v adapter in the vehicle and it can now damage the GPS radio signal within a certain range.