Although there are various types of earphones on the market, fundamentally speaking, the variety of earphones is very limited. According to product structure, it can be divided into: open, semi open, and closed; From the perspective of wearing methods, it can be divided into: headwear, earplug, in ear, rear hanging, and ear hanging; According to the principle of energy exchange, it can be divided into two types: dynamic and static earphones: headbands: headbands are generally divided into steel headbands and plastic headbands. Steel head straps are usually equipped with a steel beam inside a PVC hose, and there are also two types of straps: double head straps and single head straps. Headphones with a steel headband structure are usually equipped with an elastic leather headband outside the steel beam to adjust the comfort of wearing. Plastic headbands are generally made of PP material, which makes them softer and more resilient
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China