Title: No serial number?
Review: I have this DSP headset. It work well at the beginning but after about 4 months, the right side speaker does not function, so the sound are only are from the left side. When I try to send it for the warranty repair, the support said that I need the proof of purchase, but I lost it.The headset doesn't even have the serial number, this make it very hard to claim the warranty.
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