Disguises your voice by digitizing it. The degree of change can be adjusted as you are speaking by pressing the buttons located on the front of the unit.  Compatible with all telephones because you simply hold it over the mouthpiece and speak normally. 

This voice changer is a novelty item used for fun.  For a more realistic sounding voice, you'll want to get the TVC-II.

Features: 

• On/off switch
• 9-volt battery powered (not included)
• Dimensions: 4" x 2" x 3/4"
• Weighs 3.9 ounces
• Easy hook up