Wireless Bluetooth Speaker with Rechargeable Battery. Compatible with MP3/4 devices, TF/USB Flash Drive, or any audio device which is Bluetooth compatible or has a 3.5mm jack. You just need to pair you phone or other music player which support Bluetooth with the speaker. After paired, you can enjoy the music with speakers that offer you great sound quality. Moreover, if your device does not have Bluetooth function, you have no need to worry about it. The speaker’s “AUX” mode allows to connect with any audio device, after connected, the speaker play the music of the connected audio device.The microphone with allow you to make and receive hands free call and listen to other party loud through the speaker. Auto connected to call even you are playing music and auto connected to music after call over.