This appears to be a device that uses electrolysis to generate hydrogen and oxygen from water, which are then combusted to launch a rocket. It is said to ascend approximately 40 meters. Brand/Manufacturer: Taiyo Model Number: Safety Rocket Mercury Size: The dimensions of the outer box shown in the photo are 41cm x 36cm x 12cm. This is an unused, unopened item that has been stored for a long time, but it was opened and inspected for the listing. The outer box is damaged, but the contents are new. Since it has not been used, I do not know how it feels to use. Please understand that this is sold as-is. Please ask if you have any questions.