i think you can go to buy a cell signal scrambler

We have been developing systems for countermeasures against cheating in exams, and many customers have previously strongly requested this. Recently there was a news arrest of criminal suspects and accomplices who committed high-tech cheating in driving license examinations.We put development and verification first and finally completed it. Our new cell phone jammer goes a step further and the radio wave jammer detects specific radio waves and works with the jammer. This is a new cell phone jammer product that is turned on to block mobile phone signal transmission only when necessary.

According to related literature, electromagnetic radiation is a phenomenon in which energy is emitted into space in the form of electromagnetic waves. Natural electromagnetic radiation comes from the thermal radiation of the earth and the sun. Artificial electromagnetic radiation is radio, television, communication base stations and various application facilities in daily life. Electromagnetic radiation sources are clearly visible in our daily lives, such as personal computers, mobile phones, microwave ovens, and Wi-Fi networks.Adults use their mobile phones to browse news and shop,children connect to the Internet through their mobile phones to make online friends, play games, etc.

This not only affects the children's health, but also affects their school performance, so parents are advised to use cell phone jammer to reduce or avoid children's transition to mobile phones.With the rapid popularization of communication equipment such as mobile phones and PHS, the convenience of people's lives has improved, but in quiet spaces such as theaters and halls, the ringtones from communication equipment and the noise from phones have become a Serious social problems. If you are enjoying a critical moment of a movie, you will be very angry if a fast ringtone interrupts you. At this time, you only need to use the Cell Signal Scrambler to avoid this situation.