This portable speaker comes close to perfection, except in its lack of thump.
If we cared only about features and ease of operation, the $50 Sbode M400 Bluetooth speaker would be a serious contender. It’s weather-resistant, it can play music stored on a microSD card, it can double as a speakerphone, it can be paired with a second M400 for true stereo reproduction; heck, it even has an old-fashioned FM radio onboard. About the only thing missing is the ability to charge other mobile devices via USB.
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https://www.techhive.com/article/3252778/sbode-m400-bluetooth-speaker-review-fantastic-features-but-not-much-bass.html