Review on Sony - C400 Wireless Behind-Neck In Ear Headphone White (WIC400/W) by Agata Buczkowska  (B ᠌

That is simply not competitive at that price. There were uncertainties when I took it. Luckily, it turned out that the concerns were baseless. The soup more than paid for itself. Got advantages: 3 years of dependability with regular flight. Connection to smart - 25 meters in a straight line, no issues in a kopeck piece residence. The connection or connections hardly ever break when you turn your head. fantastic battery life (the main criterion was when buying). The standards are audible even on the street or in production because to the excellent microphone quality. The buttons are simple to locate. Cons: The wires tan even at a faint minus; to prevent cracking, you must close it with a badlon or hood. The wires are thin and appear to be so. Even when his ears were off or pausing while wearing, he maintained the ear pads there (in order to minimize the likelihood of hooking and tearing - perhaps for this 3 years as good as new). Not for sweating and rain.