Speak into the microphone and listen for sound coming from the speakers. Adjust volume concentrations as needed right until you’re glad with how everything sounds. The microphone input with echo outcome boosts your vocal. The line input permits you to connect external audio resources such as MP3 player, CD https://www.bluetoothspeaker.top/wireless-speaker-outdoor-subwoofer-with-led-flashing-colorful-metal-bass-speaker/