The 20 MJ-20 is a highly effective ultrasonic jammer. It is designed to protect confidential information during meetings and conversations. It generates a unique ultrasound signal that blocks the microphones within the range of the device without interfering in the conversation. When turned on, the jammer virtually blocks the operation of any device with microphone and which are designed to record or transmit an audio signal. Such devices are: Mobile phones, dictaphones, audio recorders, wired and radio microphones used for eavesdropping, video and audio conferencing systems, GSM microphones, etc.
The jamming range depends on the type of the microphone and its design. The optimal microphone jamming is from 0.5 to 2 meters. Highly sensitive microphones can be blocked at 12 meters distance or more. These are the microphones of the top models of mobile phones from various brands. The transmitters can work separately as a stand- alone jammers. The best effect however is when they work together. Based on our experience however we would recommend using two sets- one set on the table, the second one under the table.
The set includes:
– Ultrasonic Jamming device – 2 pcs.
– Power supply 5 V – 2 pcs.
– Remote control – 2 pcs. The remote control can be programmed to work with up to 4 devices.
– Warranty – 12 months.
| Technical Specifications | |
| Operating frequency | 25 Khz, 33 Khz |
| Directional diagram | 60 o horizontal and vertical |
| Manual control | Buttons and light indicators for switching on/off, noise and battery level |
| Remote control | Switching on/off, range ~ 40 meters |
| Wireless remote control | 433.92 MHz frequency in the ISM band |
| Power supply | 220 V AC and 12 V DC built-in accumulator batteries |
| Operation time with battery | Up to 7 h |
| Weight of one ultrasonic device with batteries | 0.9 Kg |
| Size of one device | L203 x H158 x T65 mm |
