While many Bluetooth speakers are portable, they only come with only one driver, causing a liner sound. On top of that, the drivers in the speakers should be positioned slightly aside with one another so you can hear the differences in the sounds. Portable speakers with a built-in battery https://www.bluetoothspeaker.top/original-wireless-speaker-bt-outdoor-subwoofer-hi-fi-sound-quality-waterproof-portable-speaker/