Feature: 1. Teching cylinder engine assembly kit is a metal structure assembly model, the main material is aluminum alloy with anodized exterior, and the structure is a real industrial structure. 2. Assemble parts using various tools with the installation procedures and methods substantially compliant with practical industrial requirements. 3. Improve the user's hands‑on ability and concentration, understand various industrial machines, and study various industrial structures. 4. Using CNC accurate casting process, aluminum alloy oxidation, mechanical structure is extremely prominent, clear transmission process is clear at a glance, ideal for gift collection. 5. Including 217pcs, the entire assembly process takes about 3 hours. When assembling, you will understand the working structure of the car. 6. The electric motor and 500mah lithium battery work together, and it can work for about 30 minutes at full power. Specification: Item Type: Cylinder Engine Assembly KitOverhead Camshaft.Model: DM14 (the propeller is plastic) Main Material: Anodized aluminum + stainless steel Process: Anodizing Size: Approx. 215 x 135 x 210mm / 8.5 x 5.3 x 8.3inNumber Of Parts: 217pcs Charging Voltage: DC5V Lithium Battery Capacity: 3.7V, 500mAh Charging Time: 2 hours Working Time: 1.5 hours Assembly Time: About 3 hours Difficulty Of Assembly: Level IV Suitable Age: 14 years old and above Product Standard: GB/T9254-2008, GB/T17626.2-2006 Quality: A How To Use: The assembly is complicated, follow the instructions to guide the assembly Structural Features: 1. Double-acting V-type cylinder structure 2. Overhead camshaft valve control structure 3. Synchronous cam drive mode 4. Traditional crankshaft connecting rod system 5. Single inlet and exhaust valve structure Package List: 1 x V2 Engine Assembly Kit(217pcs)1 x User Manual Note: