1. Product Overview
The Keeppley Sanrio Building Block Music Box series allows you to construct charming desktop decorations featuring beloved Sanrio characters: Cinnamoroll (K20837), My Melody (K20838), and Kuromi (K20839). These models are designed to be both a creative building experience and a delightful music box that rotates with cheerful background music (BGM).

Image: Overview of the Keeppley Sanrio Building Block Music Boxes, showing Kuromi and My Melody models.
Package Contents:
- Building block pieces (ABS Plastic)
- Instruction manual (visual guide for assembly)
- Music box mechanism
- Character figure (e.g., Cinnamoroll, My Melody, Kuromi)
Safety Warning:
⚠ WARNING: This product can expose you to chemicals including phthalates (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Do not swallow small parts. Keep away from young children.
2. Assembly Instructions
Follow the detailed visual instructions provided in your product package. The assembly process involves connecting small building blocks to construct the base, the character's environment, and the music box housing.
- Unpack Components: Carefully open the packaging and lay out all building block bags and the instruction booklet. Verify all parts are present according to the parts list in the manual.
- Base Assembly: Begin by assembling the base of the music box, following the step-by-step diagrams.
- Internal Mechanism: Integrate the music box mechanism into the base as instructed. Ensure it is securely placed.
- Character Environment: Construct the decorative elements and the character's platform. For Cinnamoroll (K20837), this includes elements like stars, rainbows, and candies.
- Character Placement: Attach the Cinnamoroll, My Melody, or Kuromi figure to its designated rotating platform.
- Dome/Cover: Secure the transparent dome or cover over the assembled scene.

Image: Example of Cinnamoroll Music Box components before assembly, showing the character and various building blocks.
Each model (K20837, K20838, K20839) has unique decorative elements. Refer to the specific instructions for your model.
3. Operating Instructions
Once assembled, your Keeppley Sanrio Building Block Music Box is ready to play its cheerful melody and rotate the character.
- Locate the Winding Mechanism: On the side or bottom of the music box base, you will find a winding key or knob.
- Wind the Music Box: Gently turn the winding key clockwise until you feel a slight resistance. Do not overwind, as this can damage the mechanism.
- Enjoy the Music and Rotation: The music box will begin to play a melody, and the character (Cinnamoroll, My Melody, or Kuromi) inside the dome will rotate.

Image: Demonstrating how to wind the music box mechanism to activate the melody and rotation.

Image: Cinnamoroll music box in operation, with the character rotating to the background music.
4. Maintenance and Care
- Cleaning: Use a soft, dry cloth to gently wipe dust from the blocks and the dome. For stubborn dirt, a slightly damp cloth can be used, but ensure no water enters the music mechanism.
- Storage: Store the music box in a cool, dry place away from direct sunlight to prevent discoloration or damage to the plastic.
- Handling: Handle the music box with care. Avoid dropping it or applying excessive force, especially to the winding mechanism.
- Avoid Liquids: Keep the product away from water and other liquids to prevent damage to the music mechanism and plastic components.
5. Troubleshooting
- Music Box Not Playing/Rotating:
- Ensure the music box has been properly wound. Gently wind the key clockwise.
- Check for any obstructions preventing the character from rotating.
- If the mechanism is jammed or broken, do not attempt to force it. Contact customer support.
- Missing or Damaged Parts:
- Before assembly, carefully check all bags against the parts list in the instruction manual.
- If parts are missing or damaged upon opening, contact the seller or manufacturer for assistance.
- Difficulty Assembling:
- Refer to the visual step-by-step instructions carefully.
- Ensure blocks are oriented correctly and pressed firmly into place.
- Do not force blocks together if they don't fit; double-check the instructions.
6. Specifications
| Feature | Detail |
|---|---|
| Brand | Keeppley |
| Models | K20837 (Cinnamoroll), K20838 (My Melody), K20839 (Kuromi) |
| Material | ABS Plastic |
| Block Type | Small building block (Compatible with Lego) |
| Recommended Age | 14+ years, 18+ years |
| Power Source | Mechanical (No Battery Required) |
| Origin | Mainland China |
| Approx. Assembled Dimensions (H x W x D) | 18.5 cm x 12.5 cm x 12.5 cm (for all models) |
| Approx. Package Dimensions (L x W x H) | K20837: 22.5 cm x 12 cm x 24 cm K20838/K20839: 22.5 cm x 16 cm x 24 cm |
| Approx. Weight | 0.8 kg |

Image: Detailed dimensions and specifications for the Cinnamoroll (K20837) model.

Image: Detailed dimensions and specifications for the My Melody (K20838) and Kuromi (K20839) models.
7. Warranty and Support
This product is manufactured by Keeppley. For any issues regarding product quality, missing parts, or assembly difficulties, please contact the seller or manufacturer directly. Keep your proof of purchase for warranty claims.
Please refer to the packaging or the seller's store page for specific warranty terms and contact information.
8. User Tips
- Organize Parts: Before starting assembly, sort the building blocks by color and size to make the process smoother.
- Follow Instructions Closely: Building block sets often have intricate steps. Pay close attention to the visual guides to avoid errors.
- Display Safely: Place your finished music box on a stable surface where it won't be easily knocked over, especially if it's a decorative item.