OnePlus has unleashed new versions of its wireless earphones alongside its new 8-series of flagship phones. This new generation has an improved range of color options compared to its predecessors. It also features low-latency connections and a battery that can support up to 20 hours' worth of playback.
https://www.notebookcheck.net/OnePlus-Bullets-Wireless-Z-still-not-TWS-but-at-least-more-colorful.461607.0.html
Frankly, I don't understand the appeal of TWS earphones. I like banded designs not only from engineering perspective, but also from purely practical - they're much less likely to fall who knows where and it's easy to just pull them out and leave them hanging. Problem was never a cable between sides, but a cable going to a device. As long as the band is comfortable on the neck, it's my preferred solution.