“Ssst, do you know that the bluetooth speaker is employing a radio frequency technology? You do? Properly, but do you know that radio frequency is strictly regulated? Powered by an enormous 1000 watt amplifier, the Electro-Voice ZLX-12BT is able to offering an impressive amount of power and audio output. https://www.bluetoothspeaker.top/bluetooth-speaker-wireless-speaker-with-multi-function-of-aux-bt-usb-fm-tf-card/