1. Multiple variety specifications: There are more than 20 international universal series, with more variety specifications.

　　2. Relying on mechanical structure to ensure electrical characteristics, it belongs to mechatronics integration products and has essential differences from other low-frequency connectors.

　　3. Part processing is mainly done by turning machines, and there are many manual operations during assembly, making it difficult to perform automated assembly.

　　4. Slow product updates and upgrades.

　　5. It is an important component of electrical connectors and belongs to labor-intensive products with certain technical content.

　　6. Product reliability, complex failure modes and mechanisms.

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