Review on 🎧 KINDRM Bluetooth 5.0 Receiver: Portable Wireless Stereo Adapter for Car/Home Systems with Hands-Free Calling, TF Card Support by Chad Black

This supports the apt x codec for HQ audio, but if your device doesn't support it it will default to the sbc codec which is quite poor quality. It's not bad, but the high frequencies do ring out and the audio is generally not as clear as when inputting directly into the phone. I found out that to get the best BT quality from iPhone, you need a BT module that supports AAC codec. Some of the advantages of this device are that it has a decent distance and is easy to connect as well as easy to use.