Mini Hot Air Stirling Engine Motor Model Stream Power Physics Model Educational Science Toy Gift For Children

I recommend it's really nice, comes with the small key BTR if ever the wheels loosen. Comes with a white LED and another multi-color led. The system only turns in one direction so well checked the polarity before soldering the led.

It was a very pleasant shopping experience the product is of excellent quality and meets the said. I appreciate the fast shipment to Colombia.

Beautiful. Really cool, well done! Great ornament and functional! Is not perfect mechanically but far beyond expectations! Recommend.

came well packaged. works like a charm. great for science demos in class. instructions in english are minimal, could be better.

Thank you cool thing, my husband liked the gift. We haven't started yet, we need alcohol. But I think it will be fine.

It works very well. Clean motion and no much noise. Comes with two led lights connecting to the engine

As described. Very well movement and smooth. If you change the size of pulley, generates about 7VDC

Delay in delivery from order time to delivery time were in 51 days

Good quality, suitable price. It works well.

Delivery is not very fast (((and so a toy)))

cool product for science teaching

Excellent buy everything ok

Great, it works very well.

Works fine. Baby happy

Everything works fine

Everything works

Very fine!

Great Toy

Running

Super

Bien