FM radio/mp3 player waistband loudspeaker with reverberation of sound with headset microphone used for yoga,tour guide,teach Item No.: ... Microphone, Amplifier, Loudspeaker,Music play and FM radioSupporting TF card or USB for music ( mp3 format ) ( USB 2.0/1. ... Battery working time Keep working in 7-8 hours Function Mp3, FM radio, Amplifier, loudspeaker, microphone, reverberationColor ChoiceBlack,Red, ...