Attach this voice changer to your key chain and you can change your voice whenever you want because you will 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 using your phone at home or your cell phone or a pay phone no one will be able to recognize your voice. Simply place it over the phones mouthpiece and adjust the setting and speak normally. Extreme settings sound hilarious and are great for practical jokes. Mid-range settings make anyones voice sound deep and masculine. Great for fooling your friends or to protect women and children when home alone. Simple to operate. Battery included.Attach this voice changer to your key chain and you can change your voice whenever you want because you will 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 using your phone at home or your cell phone or a pay phone no one will be able to recognize your voice. Simply place it over the phones mouthpiece and adjust the setting and speak normally. Extreme settings sound hilarious and are great for practical jokes. Mid-range settings make anyones voice sound deep and masculine. Great for fooling your friends or to protect women and children when home alone. Simple to operate. Battery included.