Bullhorns are portable loudspeakers that amplify sound, making it easier for a person to be heard in noisy environments or large crowds. They typically consist of a microphone, an amplifier, and a horn-shaped speaker that directs the sound. Bullhorns are commonly used in various settings, including protests, sports events, and emergency situations. These devices can be powered by batteries or electricity, and many models come with features like adjustable volume and sirens. Bullhorns are popular among coaches, activists, and emergency responders for their ability to project a clear message over distances.