The Wonderboom 4 provides a purely natural balance of bass to midrange to treble, which usually means no instruments or voices are unnaturally boosted. For all 25 speakers we tested, the average battery life was somewhat under 17 hours. The Sony Ult Field seven wins the title for best https://www.bluetoothspeaker.top/bluetooth-speaker-support-bluetooth-tf-usb-with-a-wireless-microphone-function/