Review on Sony - C400 Wireless Behind-Neck In Ear Headphone White (WIC400/W) by Anastazja Kazak ᠌

A few personal observations. The bezel cannot be rolled up and placed in a regular pocket since it is stiff. It makes it more likely that you will forget to take it off your neck in the morning at home or where you posted it. The battery has a very long life. The charging indicator, however, is annoying. Empirically determined, a 50% indicator means that a charge is urgently required. They might suddenly crash at any time. It is simpler to get the phone itself in the winter on the street when the headphone rim with the microphone and control buttons is hidden under a jacket and jacket, for talking, etc. Don't forget to switch the sound from the headphones to the phone's speaker either.