... , tf card slot to read FM radio, MP3 player,Amplifier function Item Name: Mini portable voice waistband amplifier with USB ... with Entertainment,Microphone, Amplifier, Loudspeaker,Music play and FM radioSupporting TF Card and USB for music ( mp3 format ... 2000 mABattery working timeKeep working in 7-8 hoursFunctionMp3, FM radio, Amplifier, Line-in, loudspeaker, microphone, reverberationColor ChoiceLight ...