Best thing I’ve found. Acoustic Research made RF speakers. They got their signal from a transmitter with audio in cables. I plug this into my Alexa and 4 wireless speakers use the signal on my front and back porches. I know, it’s only RF. But honestly, if your listening to music outside with other sounds going on around you, it doesn’t have to be super high quality. The best thing about these is that as long as the speaker and transmitter both have power, they start playing without the need to re-pair, no matter how long it’s been since they last played. Any Bluetooth speaker I’ve tried drops the signal once sound stops for a length of time. If I could find more of these I would buy them, last add-on I git was from EBay a few years ago.