... MP3 input ,Echo, 4.FM Radio 5.25W. This mini speaker is widely used at home, office , school , church , factory ... you speak via headset microphone and voice amplified via speaker box.Other advantage (different model different function)1.MP3 ... ,1800MA;22650,3000MAINSIDEBATTERY PACKprevious&next song switchSEICO IC CHIPDUAL PROTECTION CERTIFICATESISO 9001:2008,CE,FCC,CB PACKING DETAILS1. 1SET ...