... built in battery,rechargable. Product Details: Brand NameEWAModel NumberEWA-A1 FM speaker TypePassive UseHome Theatre, Portable Audio Player, Mobile Phone, Computer ... ROHS3.One year international warranty4.Battery:Built-in,rechargeableSelling Point:1.The built-in 3.5 mm audio jack allows you ... MP3/4, etc High quality with gift box package! 2012 Newest promotional mobile speaker aux in all music devices