The FIIL T1X have alright Bluetooth connectivity. While they support Bluetooth 5.0, they can’t be paired with multiple devices and they’re not NFC-compatible. They also have high latency on PC, iOS, and Android when streaming video. While some apps and devices seem to compensate for this differently, there’s also a setting in the app called ‘Low-Latency Mode’ which helps to reduce lag and we measured 120ms of delay in this mode. However, it still uses the default SBC codec and not the aptX-LL codec. That said, your real-world experience may vary.