Introduction
Welcome to the world of creative construction with your choopheme 10-in-1 STEM Building Block Engineering Set. This manual provides detailed instructions to help you assemble and enjoy up to 10 different engineering vehicles, fostering an understanding of science, technology, engineering, and mathematics through engaging play. Please read all instructions carefully before beginning assembly.
Safety Information
WARNING: CHOKING HAZARD - Small Parts. This product contains small parts and is not suitable for children under 3 years of age. Adult supervision is recommended during assembly and play to ensure safe handling of all components. Keep all packaging materials away from children.
Package Contents
Your choopheme 10-in-1 STEM Building Block Engineering Set includes:
- 112 pieces of construction blocks and connectors
- 4 durable wheels with rubber tires
- 1 screwdriver tool
- 1 wrench tool
- 1 instruction manual with visual guides for 10 models
- 1 sturdy storage box

Figure 1: Overview of included components and tools.
Assembly Instructions
This set allows you to build 10 different engineering vehicles. Please refer to the included instruction booklet for detailed, step-by-step visual guides for each model. Only one model can be built at a time using the provided pieces.
General Assembly Tips:
- Organize Parts: Before starting, sort the pieces by type and size to make assembly easier.
- Follow Steps: Adhere to the sequence shown in the instruction booklet. Each step builds upon the previous one.
- Secure Connections: Use the provided screwdriver and wrench to ensure all screws and nuts are tightened securely, but do not overtighten.
- Visual Guidance: The instruction booklet features clear diagrams. Pay close attention to the orientation of pieces.

Figure 2: Example page from the visual instruction booklet.
Example Models:
The set includes instructions for models such as a bulldozer, toy crane, forklift, wind mill, gantry crane, carrier vehicle, and rotary crane. Here are some examples of the models you can build:

Figure 3: A selection of the 10 possible models.
Assembly Demonstration Video:
Video 1: A demonstration of assembling various models from the choopheme STEM Building Block set.
Operating Instructions
Once assembled, your engineering vehicles are ready for interactive play. Many models feature movable parts, such as rotating cranes, functional scoops, and rolling wheels. Encourage imaginative play and exploration of mechanical principles.
- Movement: Push or pull the vehicles to make them roll.
- Interactive Parts: Manually operate levers, cranks, or rotating components as designed for each model.
- Creative Play: Use the assembled models in various play scenarios to enhance creativity and problem-solving skills.

Figure 4: Child engaging in play with an assembled model.
Maintenance and Care
To ensure the longevity of your choopheme STEM Building Block Engineering Set, follow these care guidelines:
- Cleaning: Wipe parts with a damp cloth and mild soap if necessary. Avoid harsh chemicals or abrasive cleaners. Ensure parts are completely dry before storage.
- Storage: Store all components in the provided sturdy storage box when not in use. This prevents loss of small parts and protects the set from dust and damage.
- Inspection: Periodically check for any loose or damaged parts. Replace or repair as needed to maintain safety and functionality.

Figure 5: Cleaning the building block components.
Troubleshooting
If you encounter any issues during assembly or play, consider the following:
- Missing Parts: Double-check the storage box and surrounding area. If parts are genuinely missing, contact customer support.
- Loose Connections: Ensure all screws and nuts are properly tightened.
- Model Instability: Review the assembly steps for the specific model to confirm all pieces are correctly attached and oriented according to the instructions.
- Difficulty Assembling: Refer to the visual instructions carefully. Some steps may require adult assistance, especially for younger children.
Specifications
| Product Dimensions | 10 x 6.1 x 5.07 inches |
| Item Weight | 1.9 pounds |
| Model Number | J-77 |
| Recommended Age | 3 years and up (with adult supervision for younger ages due to small parts) |
| Manufacturer | Yuanyi |
| Number of Pieces | 112 |
Warranty and Support
For warranty information or customer support regarding your choopheme STEM Building Block Engineering Set, please contact the manufacturer, Yuanyi, directly through their official channels or the retailer where the product was purchased. Please retain your proof of purchase for any warranty claims.