... microphone used for tour guide,teaching teaching portable wireless amplifier Item: GS-102 High lights:Multifunction all ... one with Entertainment,Microphone, Amplifier, Loudspeaker,Music play and FM radioSupporting TF card or USBfor music ( mp3 format ... 2000 mABattery working timeKeep working in 7-8 hoursFunctionMp3, FM radio, Amplifier, loudspeaker, microphone, reverberationColor ChoiceBlack,Red, ...