Baseball audio speaker 1,with battery cover 2,easy to carry 3,newdesign 4,ROHS&CE Baseball audio speaker (speaker cabinet,round speaker);1,with battery cover2,easy to carry3,newdesign4,ROHS&CEpower rating:2Wimpedance:4Ωfrequency response:275-20KHzpower supply:3Vusage:ipod/iphone/PC/MP3/computer/mobile phone.