The Wonderboom 4 delivers a purely natural stability of bass to midrange to treble, which usually means no instruments or voices are unnaturally boosted. For all twenty five speakers we tested, the average battery life was a little under seventeen hrs. The Sony Ult Field 7 wins the title https://www.bluetoothspeaker.top/factory-wholesale-studio-wireless-bluetooth-speaker-waterproof-outdoor-speaker/