Square dance jammer is useful. The essence of a high-power remote control, by transmitting infrared light, you can make the audio shutdown, switch mode, cut the song, etc., can not work properly. The rule of noise pollution is not the same as the rule of square dancing, square dancing enthusiasts hope to strengthen self-discipline. This kind of square dance jammer signal belongs to a kind of radio signals. However, their jammers are only for smart audio with Bluetooth and wireless remote control, the best effect in the range of more than 50 meters, it does not work on the old stereo.