Do not buy from Weisailing Network Technology Co.Ltd. I bought a set of Bone conduction headphones. After 1 week they started to drop in & out, then the left side stopped working. Sent an email to them. They asked for a video of the problem. Sent them that. They offered $16 as compensation. I paid over $60. They will not replace them under warranty & said I could keep them. I don't know why as they don't work. Avoid them like the plague.
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