The neckband is not as flexible as Skullcany Ink wireless or LyreBeats-NB1, instead the band is hard-plastic case. Nevertheless it is pretty lightweight, and it feature a motor that vibrates when there is a call. The neckband is basic and solid. A nice feature that you can shorten the cable by cable adjuster and stopper (the ball) – keep things neat around your neck.
The control buttons are on the left, including power-button and volume controls they are responsive and feel solid once pressed. The mic is also on the left-remote, the earbuds are compact and small but feel quite cheap (just like other cheap Sony earbuds).
Spec that matters
- Driver size: Dynamic 9mm
- Frequency response: 8Hz – 22kHz
- Charing time: 4.5 hours
The battery life of C400 is rated at 20 hours, which is longer than most wireless neckband headphones’s battery in the category. But it also comes with a compromise that the time for charging is 4.5 hours, and no quick-charging feature is built in.
The C400's bass isn't plentiful, but it is still there and punchy. The mid-range is smooth and natural. The treble is dedicated and quite aggressive and sometimes feel edgy.
The Bottom Line: Focus on battery life, easy of use the Sony C400 offer the standards that every neckband Bluetoth headphones offer. And what makes them worth more is solid design, balance sounding profile and comfortable fit.
- Solid build-quality
- Impressive battery life
- A bunch of color options
- Vibration on in-coming calls
- Comfortable and lightweight
- Balanced sound is suitable for a lot music genres
- Strong bass