For about eight months this item has seemed to charge normally, but suddenly it's now making a high pitched buzzing noise similar to other reviewers. I'm very afraid it will get worse and end up burning my hardware, especially if it's a sign of the charger failing. I have other chargers that work with no problems. While it looks like it comes with a 12 month warranty, I have no idea who to contact to take a look. specific question. I told them and they sent a replacement within 24 hours. I was very impressed with their response time and glad I got a replacement so quickly. Let's hope the new charger is silent. If anything changes I'll update, but so far I'm very happy with their resolution.
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