Attach this voice changer to your key chain. You can change your voice whenever you want, because you'll always have it with you. This is the smallest voice changer in the world. It measures less than two and a half inches tall and less than one and a half inches wide! Whether you are using your home phone, cell phone or a pay phone, no one will be able to recognize your voice. Simply place it over the phone's mouthpiece, adjust the setting, and speak normally. Extreme settings sound hilarious and are great for practical jokes. Mid-range settings make anyone's voice sound deep and masculine. Great for fooling your friends or to protect women and children when home alone. Simple to operate. Battery included.