The Voice Alterer was seen in "Malled". The gadget appears to be a blue and grey choker with an external speaker and built-in microphone in the center. As the name implies, this gadget allows the user to change their voice. The Voice Alterer must be worn in order to be utilized, and the audio mode is operated by pushing together the sides of the center piece, activating the speaker and microphone.
This gadget made its only appearance in the episode "Malled". Alex used the Voice Alterer to assume the voice of Simon Tucker, ordering his ACT teams to attack the third floor of the Beverly Hills Mall so that she and and Clover could isolate and restore Sam.