Bluetooth codecs: For reasons I cite in my blog about Bluetooth audio codecs, we didn’t mandate the inclusion of any specific Bluetooth codec—the technology that lowers the amount of knowledge inside of a digital audio file so it could stream reliably around a Bluetooth connection. �?It’s very expensive. $449 https://www.bluetoothspeaker.top/multifunctional-card-music-playback-speaker-bluetooth-speaker-wireless/