Bluetooth codecs: For reasons I cite in my blog site about Bluetooth audio codecs, we didn’t mandate the inclusion of any specific Bluetooth codec—the technology that reduces the amount of knowledge inside of a digital audio file so it can stream reliably around a Bluetooth connection. It's a USB https://www.bluetoothspeaker.top/newly-launched-high-quality-white-noise-bluetooth-speaker-to-help-babies-sleep/