The Wonderboom 4 provides a organic balance of bass to midrange to treble, which suggests no devices or voices are unnaturally boosted. For all 25 speakers we tested, the average battery life was slightly under seventeen hours. The Sony Ult Field seven wins the title for best battery life https://www.bluetoothspeaker.top/wireless-speakers-free-sample-powerful-hot-selling-private-model-led-light-speakers/