USB/ TF card waistband amplifier with reverberation of sound with headset microphone used for ... Microphone, Amplifier, Loudspeaker,Music play and FM radioSupporting TF card or USB for music ( mp3 format ) ( USB 2.0/1.1 )With USB recharge ... timekeep working in 7-8 hourse Function Mp3, FM radio, Amplifier, loudspeaker, microphone, reverberationColor ChoiceBlack,Red, BlueWeight 225g ( including ...