The final style of Bluetooth microphone could be the stereo microphone that incorporates two inbuilt microphones picking up sound from the left and right directions. For all twenty five speakers we tested, the average battery life was a little bit under 17 hours. The Sony Ult Industry 7 wins https://www.bluetoothspeaker.top/new-bluetooth-speaker-subwoofer-inalambrico-party-music-wireless-speaker/