A megaphone is a portable device used to amplify sound, making it easier for people to hear a speaker from a distance. It typically consists of a cone-shaped body that directs sound waves outward, often powered by batteries or a hand-crank. Megaphones are commonly used in various settings, such as sports events, rallies, and emergency situations, to ensure clear communication. These devices can vary in size and power, with some designed for personal use and others for larger crowds. Many megaphones also include features like a built-in microphone and volume control, enhancing their effectiveness in delivering messages to a wide audience.