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Noise Cancellation Headset

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Noise Cancellation Headset

Model: MDRNC31E

 

I have bought this Product couple of years ago, now I am confused with the Serial Number mentioned on the Tag attached to the Headset, Box Serial Number and User Manual Serial Number.

 

I am seeing 03 different Serial Numbers on each of them, please let me know how to figure out the Serial Number of my headset.

 

Awaiting for your kind support.