The Speaker Has A Built In 6.000Mah Lithium-Ion Battery. Reliably Get About 2 To 4 Hours Of Playtime On A Single Full Charge Comes With Convenient Charging. 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. Is Built To Resist Wear And Tear, And Can Stand Up To Water, Dust, Or Even Sand! Fine Mesh And Innovative Fabric Make The Speakers Built To Last. 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.