perhaps you are intrested diy bluetooth signal jammer

With the development of jammers, it is not difficult to achieve the blocking of multi-function signals. If you want your phone to be protected from WiFi signals and other signals at the same time, you only need to buy a portable signal blocker in our store.wifi jammer are used in conference rooms, cinemas, schools, hospitals, etc., such as conference rooms and offices, where you need to be quiet. You can use this WiFi signal jammer to block the mobile phone signal and WiFi signal at certain areas around you depending on the signal strength of a particular area. this interference device output power, the interference range is large, many schools are using.

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.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 Diy Bluetooth Signal Jammer.

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.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.