Selected Products by DjuiinoStar Most Classical LTD Add to Cart Assembly Engine Kit Add to Cart Bi-Metal Spinning Top Add to Cart Premium Gyroscope Add to Cart 300+ Pc, 5 Hr, Engine Kit Add to Cart Silent Fidget Slider Add to Cart High Performance Spinner Add to Cart Customer Reviews 4.7 out of 5 stars 2,125 4.4 out of 5 stars 278 4.5 out of 5 stars 40 4.3 out of 5 stars 431 4.3 out of 5 stars 33 4.2 out of 5 stars 286 4.6 out of 5 stars 217 Price $36.95$36.95 $49.95$49.95 $79.99$79.99 $45.95$45.95 $458.00$458.00 $22.85$22.85 $79.99$79.99 Model DLTD-303 DIY-605 DST-811R DG-5PRO-05 DM13-1 DFS-28 DST-808 Overall Size (L/W/H) 4.1 x 4.1 x 4.9 inchES 6.3x2.4x2.4inch after assembly 1.2x1.1x1.1inch 2.8x2.8x3.6 inch 5.9″x4.7″x 7.0″ 2.13 x 1.22 x 0.47 inches 1.15"x1.15"x1.09"; 3.93"x0.59" Weight 0.52lb 0.74lb after assembly 42g 0.45lb 3.8lbs 1.2 oz 0.54lb Power Boiling Water/Hot Cofffee Alcohol (purity >=95%) N/A N/A Built-in Battery N/A N/A RPM 60-220 1500-2000 N/A Max. 8000 N/A N/A N/A ShorT Description Unique Coffee Time, Novelty 30Min to Build A Working Model AVG Spin TIme 8-10 Min, BR 15+ Best Gyroscope Under 100 Bucks STEM Assembly Engine Kit Silent or Loud at Your Choice 10-15 Minutes by Twirling DjuiinoStar Most Classical Low Temperature Differential Stirling Engine DLTD-303 The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. It is a working model that runs! Its flywheel will keep rotating if there are enough temperature differential between top and bottom plates. It could be an unique coffee timer, a practical teaching tool, a fancy gift to those you love! DjuiinoStar will provide FREE spare parts within 1 Year. It's Cheap But Not Cheaply Made A Unique Coffee Timer, A Real Working Engine, A Novelty and A Great Gift Option! This engine is driven by the temperature differential between the top and bottom plates. To create enough temperature differential, simply put it on a cup of hot water. When in good condition, that is, after working for a while and being lubricated, it can reach a speed around 220-250 RPM driven by boiling water. Please refer to the video attached to learn how to operate and lubricate. It can run for a long time providing there are continuous heat supply. The flywheel is made by metal too. The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. 20 Seconds to Learn How to Install The Metal Flywheel Minimum assembly is required for this kit. This video will show you how to install the wheel, and how to adjust it. After that, just put it on a mug of hot water, it will start to work: put-put just like it did two centuries ago. It's fun! An Unique Coffee Timer, A Novelty and A Great Educational Tool! Very Giftable! It's a good idea to send it as a gift to your families; for engineers, tech nerds, boss or anyone who has a child in the heart. This Interesting Little Engine Will Make Everyone Excited! Great Conversation Piece It's a good conversation starter. Let it sit and run in your office, folks around will be stunned and try to find out what's happening. Practical Teach Tool A great teaching tool demonstrating the process of energy exchange. Kids will be excited and curious about why, enlighten them to explore the world. Fancy Ornament to Your Shelf With graceful design and nice craftsmanship, this engine will be a great ornament to your desk or shelf. A great eye candy to look at. Ideal Gift Option It's a good idea to give it to your families and friends; a very good gift for engineers, tech nerds, or anyone who has a child in his/her heart. Features Brand DjuiinoStar Model DLTD-303 Speed 60-220 RPM Operation Temp Differential About 54-63°F Continuous Rotation Time About 30-50 minutes on a cup of boiling water Overall size 4.06x4.06x4.92in(L/W/H) Net Weight 0.52lb Packing List Engine x1; User manual x1; FREE Spare Parts DjuiinoStar will provide FREE spare parts within 1 Year