The eraser is often seen in the examination room and there is nothing unusual about it. But if you embed an electronic device in the eraser, it would become an important test cheat tool. The little eraser actually has an article. Recently, the police investigated that some students use eraser cheating in examination. This "eraser" is actually a disguised plastic box with a display at the bottom. Other perpetrators stay around the examination room. Send the answer to the candidate using a wireless transmitter.
At present, more and more test cheating tools have appeared one after another, with the earliest hidden headphones, to the latest screen eraser, remote watch, sound guide glasses and so on. According to the statistics of relevant personnel, there are dozens of known cheating tools for exams, which makes it hard to prevent. Recently, an Australian college responded that installing cell phone and wifi jammer in the classroom has prevented students from cheating on exams.
The signal jammer device is simple, it can block all types of mobile phone signals. Once working, all mobile phones in the nearby range will not be able to make calls and send and receive messages. In other words, wifi signal jammer can block all mobile phone signal bands, such as CDMA / GSM. / DCS / PHS, etc., all mobile phone signal jamming devices of jammer-mart have this function. If you have a strong power interference device placed in the exam room, there is no need to worry about candidates using electronic devices for cheating.
For the school, nodemcu wifi jammer is cheap, powerful, and easy to use. It only needs to open the device switch during the test. The device will not affect the work of other teaching equipment in the school, nor will it affect pedestrians and neighbors. Range, the phone will run normally. After the exam is over, simply place the device in the school storage room.
