String Telephone Kit – Two-Cup Sound Phone, Sound Vibration STEM Set
Make the classic string telephone: stretch the string tight between the two cups and talk to a friend across the room.
Designed by Mematrix Lab
Description
Talk through a string
This kit makes the classic string telephone: two orange cups with diaphragm bottoms joined by a long string. Pull the string tight, speak into one cup and your friend hears you in the other. Try it slack and tight, around a corner, or with a third cup, and find out what makes it work.
Science it demonstrates
- Sound is vibration
- Sound travels through solids: the string carries it better than air
- Tension: why the string must be tight
- Early telephones and how sound was sent before electricity
What you'll do
- Thread the string through both cups and tie it off
- Stretch it tight and take turns talking and listening
- Try a slack string and compare
- Experiment with longer strings and corners
Parts list
- Two orange cups with diaphragm bottoms
- String
Good to know
- No batteries needed.
- Contains small parts. Recommended for ages 8 and up, with adult guidance.
Specs and Docs
- Model
- EK-D112
- Cup size
- Approx. 5 × 5 × 3 cm
- Power
- None needed
- Material
- Plastic
- Suggested age
- 8+ with adult guidance
Shipping
Standard shipping: $9.00 for the first item, +$1.80 for each additional item. Free shipping on orders over $260.
We ship worldwide, by default with economical international post (UPU / China Post small packet) to keep shipping costs low. Orders are usually handed to the carrier within 2–5 business days, and economical international post then takes about 10–30 business days to arrive; these are estimates, not guarantees. Delivery time depends on the destination and on postal and customs handling. If you need your order by a certain date, email us before ordering: faster shipping can be arranged, with the extra cost charged at the carrier's actual rate. Items that contain batteries or magnets are marked on their product page and ship by a special carrier line; some countries and regions cannot be reached by that line, and if yours is one of them we refund the order in full.
Customs & duties
Import duties, taxes and customs requirements depend on the destination country, the shipping route and the local customs office, so we cannot say in advance whether any will apply to your parcel. Customs may hold a parcel, ask for more information, or ask for duties or taxes to be paid, even when the declared value is correct. If you have a question about your country, email us before ordering.
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