... slot, mp3 ,fm radio,microphone yoga speakers waistband portable mini amplifier speaker Item Name: GSG-100 Specification:Multifunction all in ... 7vBattery working timeKeep working in 7-8 hoursFunctionMp3, FM radio, Amplifier, Line-in, loudspeaker, microphone, reverberationColor ChoiceLight greenWeight0.5kg ... Machine : 1 pcWaistband : 1 pcSpecification : 1 pc waistband portable mini amplifier speaker