This portable, wearable voice changer synthesizes and distorts your voice. Unit has 3 settings: Scary Monster voice, High Alien voice and Amplify your own voice. Includes belt clip and a self-lock strip. Includes enough wiring to connect unit from your belt to a microphone in your mask. Requires 3 - "AA" batteries (not included) Unit measures approximately 3" wide x 5" tall x 1.5" deep. Perfect for a monster, a Ghost Face or an Alien costume (sold separately).