1.CE,ROHS,ISO,FCC 2.Rechargeable,li-ion battery inside 3.MP3/USB/SD/MMC input, ... reverb 4.Radio,song switch 5.MOQ:100p This mini speaker is widely used at home, office , school , church , factory , hospital ... when you speak via headset microphone and voice amplified via speaker box.Other advantage (different model different function)1.MP3 input ...