The Pyle 20W Megaphone Bullhorn is a portable megaphone with a siren, perfect for outdoor use. With a small size and a 5.4'' x 8.6'' design, this megaphone is easy to carry and use on the go. It is powered by batteries and has a voice control controller, making it convenient for various recommended uses such as for surround sound systems. The megaphone has a maximum range of 800.0 feet and a green color, making it versatile for both personal and professional settings. With a passive speaker amplification type and a piezoelectric driver, the Pyle Megaphone Bullhorn is a reliable choice for amplifying sound in various environments.