Learn how sound waves travel in this string telephone, a classic kid's activity.
Pull the string taut. Place your mouth near the telephone membrane and talk into the membrane. The sound of your voice will travel along the string to the other end. Hold on tight to the string, the sound will resonate along the string until it reaches the ears. Suitable for age 3+
Dimensions - 3 x 16.5 x 9 cm Materials - cardboard, polyester, plastic PET
