This portable, wearable voice changer synthesizes and distorts your voice. Unit has 2 settings: Scary robot voice, and transposed version of your own voice. Includes belt clip. Includes enough wiring to connect unit from your belt to a microphone that you wear.  Head is small enough to fit under any mask. Requires 1 9volt batterie (not included) Unit measures approximately 3 1/2 wide by 3 1/2 tall x 1.5" deep. Perfect for a monster, a Ghost Face or an Alien costume (sold separately).