Bluetooth speakers all connect into a supply device by using Bluetooth, but that isn’t the only audio connection available for you. Some Bluetooth speakers nonetheless have a expensive headphone jack, to help you tether the speaker to your phone by wire. Passive speakers need an external amplifier and crossover https://www.bluetoothspeaker.top/factory-price-fm-am-multi-band-radio-with-bluetooth-speaker-and-aux-in/