There are such devices.
Press the on/off button and the stereo playing music in the square dance stops working. The product's effective use distance is 50-80m.
This "anti-square dance magic weapon" looks like a flashlight, and is used in the same way as a flashlight. Turn on the switch to the sound will cause interference, make it off, switch mode, cut the song.
In fact, this device is a high-power remote control, will cause interference to some speakers, so that they can not work. According to the merchant, the product effective distance of 50-80 meters, long time use will not be found, sales are not bad.
Residents who dance in the square are able to dance in the right place and time without affecting others. Although this signal blocker can turn off the stereo sound, we think it is not desirable and not a good way to solve the problem.
Electronic pulses are created by nuclear explosions and by the explosion of non-nuclear electromagnetic pulse bombs (high-power microwave bombs). The electromagnetic pulse produced by a nuclear explosion is called a nuclear EMP, and any nuclear weapon that explodes above ground level produces an EMP of about one millionth of the total energy of the nuclear explosion, at frequencies from a few hundred Hz to a few megahertz.
Non-nuclear EMP bomb is the use of explosives or chemical fuel combustion energy generated by the microwave device converted into high-power microwave radiation energy, capable of transmitting peak power in more than a gigawatt, the frequency of 1 GHz ~ 300 GHz of pulsed microwave beams.
Transient voltages of thousands of volts are generated dramatically on exposed conductors (e.g., exposed wires, printed circuit boards with printed wires), causing irreparable damage to a large number of electronic devices.