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Teletone is an old toy that show us how the voice travels through a string with a very simple explanation. When you speak your voice vibrates the membrane incorporated in the device, the vibration travels through the tight string which vibrates the membrane of the other receiver. Thus the sound caused by the vibrations goes directly to your ear.
It is a very simple toy but which makes us discover the magic of basic physical principles but virtually unknown. Toy very suitable for children between 8 and 14 years.
Length: 10.5 cm.
Diameter: 7.7 cm.
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