ed) Amplifier Voice: By adjusting volume, this 20w megaphone can be heard up to 800 feet away. Lightweight and powerful 20w bullhorn are an ideal choice for outdoor activities, cheerleading, occasion organizers Voice Changer: There are 6 different sound effects: Child, Alien, Female, Robot, Spookey, Monster. Using this megaphone bullhorn with voice changer mode at a party, holiday, game can make fun of your friends, families and increase the joy of life Please Note: This megaphone can capture your voice more effectively when you approach it by about 5cm(2in). Require 4 Pcs C Batteries(Not Included) Siren & Record: This megaphone speaker can record and play up tp 240s, highly meet your recording needs. And built-in siren can quickly attract the attention of the crowd to keep the work on track Basic Information: Diameter-5.4in/13.7cm; Megaphone Length; 8.6in/22cm. Handle Length: 4.1in/10.5cm.