I have used one of these speakers with my Pixel 4a phone and iPad. The sound quality is normal at low volume and distorted at high volume. The bass is also missing. Both results are to be expected from a speaker of this size and performance. The TWS function does not work for me. I followed the instructions that came with it and got audio out of both speakers, but the blue lights on both speakers keep flashing for up to 30 seconds without turning on. I sent an email to the support address 2 days ago and am still waiting for a reply. Updated 05/30/21. Today I got an email reply from the manufacturer and found that the Bluetooth TWS feature only works after pressing the M button on only one of the speakers, not both. This feature works very well and there is a clear left/right split for a nice stereo effect. I am very satisfied with this product and recommend it.
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