USB FM radio waistband amplifier with reverberation of sound with headset microphone ... in one with Entertainment,Microphone, Amplifier, Loudspeaker,Music play and FM radioSupporting TF card or USB for music ( mp3 format ) ( USB ... working time Keep working in 7-8 hours Function Mp3, FM radio, Amplifier, loudspeaker, microphone, reverberationColor ChoiceBlack,Red, BlueWeight 225g ( including ...