Listen Up!Book - 2004
For undercover operations or pure fun, the voice changer is the ultimate combination of silly and science! Includes everything kids need to build a working voice changer. Kids can choose to have a scary, squeaky, robotic, or booming voice.
Publisher: Bellevue, Washington : SmartLab, 2004.
Characteristics: 24 pages :,colour illustrations ;,19 x 25 cm