Your Bluetooth 5.3 Audio Transmitter offers a Voice Call Mode in addition to Music Mode and Gaming Mode (you can view the differences between modes here).
In Voice Call Mode, your Bluetooth 5.3 Audio Transmitter allows you to use your wireless headset for voice chat, however the high-quality audio streaming capabilities of aptX Low Latency, aptX HD, aptX and SBC will not be available while your Audio Transmitter is in Voice Call Mode.
If you'd like to stream your voice chat (for example while gaming) while also using high-quality audio at the same time, you can select Music Mode and Gaming Mode and use the included 3.5mm analog microphone with your connected device.