The Select 4 Go pairs a 1.75-inch 5W full-range speaker driver with a passive radiator to help bolster the intensity of lower frequencies. That’s only a slightly smaller speaker than you’ll find inside the pricier Miniroll, which has a claimed 12 hours of battery life. Soundcore says the Select 4 Go has up to 20 hours of playtime on a full charge with the volume…
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