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OKT mobile phones
official website

Step one: Using a smart phone to install scanning code software, such as "wochacha", "Win on Quick Code” etc.
Step two: Open the scanning code software against the QR code, then you can get an interlinkage.
Step three: open the link, and then enter OKT Mobile Phone Official Website.

Scanning the QR code, you can land the mobile phone website
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How about your aging test?

Generally, we make it 8 hours for downlight and panel light, troffer and 48 hours for led emergency backup.