The Wonderboom 4 delivers a purely natural balance of bass to midrange to treble, which usually means no instruments or voices are unnaturally boosted. It's a tweeter along with a woofer driver with stereo channels. It's an IP67 waterproof score with a dual passive bass radiator. You can check https://www.bluetoothspeaker.top/new-zealot-pro-portable-speaker-waterproof-wireless-outdoor-bluetooth-speaker/