Silentek offers new ultrasonic jammer which outperforms all other units tested. The UJ-20000 proved effective against all devices tested, including iphones. USA ...

Silentek's covert ultrasonic jammer looks like a speaker but is a powerful anti-recording device. It was effective against all devices tested, including iphone ...

While Wi-Fi jammers may sound like a high-tech way to bypass home security systems, this is what you really need to know ...