Sound cannons, also known as acoustic weapons, are devices that emit intense sound waves to deter or disperse crowds. They operate by producing loud noises that can cause discomfort or pain, making it difficult for people to remain in the area. These devices are often used by law enforcement and military personnel for crowd control. The technology behind sound cannons typically involves speakers that project sound at high decibel levels. Some models can target specific areas, allowing for more controlled use. While they are designed to minimize physical harm, concerns about their safety and ethical implications have been raised by various human rights organizations.