Basis: Pre-production samples or spec sheets serve as the standard for incoming material inspection. Materials must be inspected prior to mass production.

Inspection Scope: All incoming materials undergo testing, either through full inspection or sampling, to ensure they meet quality standards before proceeding to production.

Items Inspected: The inspection covers incoming materials from suppliers, including plastic shells, vibrators, speakers, motherboards, batteries, charging cables, instruction manuals, packaging, and more.

Document Comparison: Instruction manuals and packaging are also verified against customer specifications, ensuring accurate colors, content, and processes.