Manufacturing USB aquarium air pumps requires a certain level of engineering and electronic technology knowledge to ensure product performance and safety. The following are the general steps for manufacturing USB aquarium air pumps:

Design and Planning: Before starting, you need to develop a product design and planning, including determining the required performance parameters such as power, air pressure, flow rate, and noise level. We also need to design components such as shells and circuit boards.

Procurement of components: Collect required components, including electric motors, electronic components, casings, connectors, air ducts, etc. Ensure that the components meet product specifications.

Circuit design: Design a circuit board, including power management circuit, motor control circuit, and USB interface. You may need to consider using microcontrollers or integrated circuits to achieve functions such as adjusting airflow intensity and reducing noise.

Assembly: Assemble all components into the casing, including the motor, circuit board, switch, connector, and gas pipeline. Ensure all connections are tightened to ensure the structural integrity of the product.

Testing and Calibration: Before production, the product is tested and calibrated to ensure that it meets performance specifications. Testing includes power testing, airflow testing, and noise testing.

Safety certification: Before selling products, safety certification may be required to ensure that the products comply with relevant safety standards and regulations. This usually requires testing and certification through qualified laboratories.

Packaging and Marking: Design appropriate packaging, place the product in the packaging box, and indicate the product model, specifications, instructions for use, and warning information.

Sales and distribution: The prepared products can be distributed through various sales channels, including online retailers, aquarium stores, and wholesalers.

After sales service: Provide customer support and after-sales service to solve any potential problems or provide technical support.

Please note that manufacturing USB aquarium air pumps requires professional electronic engineers and manufacturing equipment to ensure product quality and performance. In addition, you also need to understand relevant regulations and standards to ensure product compliance. It is best to consult a professional manufacturer or manufacturing company for more detailed information and support on manufacturing USB aquarium air pumps.