Bluetooth speakers all connect to a source device by using Bluetooth, but that isn’t the only audio connection available to you. Some Bluetooth speakers however have a dear headphone jack, in order to tether the speaker to your phone by wire. It had been lately released in August 2018, https://www.bluetoothspeaker.top/new-bluetooth-stereo-subwoofer-speakers-music-box-round-bt-speaker-wireless/