Carry this voice changer on your key chain and you can change your voice whenever you want because you will always have it with you. At less than two and a half inches tall and less than one and a half inches wide, this is the smallest voice changer in the world! Whether you are using your phone at home, your cell phone, or a pay phone no one will be able to recognize your voice. Simply place it over the mouthpiece of the phone, 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