Bluetooth codecs: For reasons I cite in my website about Bluetooth audio codecs, we didn’t mandate the inclusion of any specific Bluetooth codec—the technology that minimizes the amount of information in a digital audio file so it may stream reliably over a Bluetooth connection. It's a USB C type https://www.bluetoothspeaker.top/new-arrival-wireless-bluetooth-speaker-original-loud-bass-subwoofer-popular/