Bluetooth speakers all connect to the source device via Bluetooth, but that isn’t the only real audio connection available to you. Some Bluetooth speakers even now have a pricey headphone jack, so that you can tether the speaker to your phone by wire. It was a short while ago https://www.bluetoothspeaker.top/factory-price-wireless-bluetooth-speaker-waterproof-with-usb-tf-tws-function-copy/