How does Yianda confirm the quality of each cctv microphone?

High quality products,good after-sale service help us gain more and more market shares. 

We can say that our microphone's failure rate is less than a thousand to one. We strictly follow by ISO 9001 standard.

Now let me show you how we works.

1. Clean and tidy Material storage area

We usually keep mostly material in stock. Therefore, we can make delivery in 2-3 days.

2. Specialist test-Using oscilloscope to check sensitivity