The portable voice changer is perfect for anyone looking to disguise their voice. Bosses might want to call their employees to test customer service skills. Parents might want to call their teenagers at home alone to see if they are behaving. This voice changer lets you adjust the pitch of your voice a lot or little for any covert situation. This unit comes with built-in microphone, an output speaker for recording devices, and a 14-pitch range. Just speak into the built-in microphone and the changer projects your altered voice. This top-of-the-line gadget also has volume controls and secures to most phones with its Velcro strap and runs off a single 9V battery (not included).