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 speakers AUX mode allows to connect with any audio device, after connected, the speaker play the music of the connected audio device. It comes with a Built-In FM Radio to listen to your favourite radio stations (How to connect FM see Manual provide with device). Rechargeable lithium battery with give you 6 Hrs. Playing time. 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.