I bought these earphones as they were well-reviewed and ridiculously cheap. These, for the the most part are a 4 star pair of headphones (for me). Great sound quality, decent comfort, build quality and battery life while being compact and wireless at a $40 AUD price point is insane. But let's talk about the bad part. There is an unignorable, high pitched, buzzing sound that is always there as soon as you turn these on, that completely ruins the experience. I don't know if I have a defect but these headphones have been hugely disappointing for me, especially since it is obvious that these could've been great.
P.S. I noticed out of all other reviews I found one other person who seemed to have the same problem, a 3 star review from Richard Noh.