... TF/SD card or USB for music ( mp3 format )With USB recharge connectorPower supply: rechargeable ... Keep working in 7-8 hours Function Mp3, FM radio, Amplifier, loudspeaker, microphone, reverberationColor ChoiceBlack,Red, BlueWeight 225g ... ,Teaching, Conference,Acoustic Instruments,Camping and other outdoor EntertainmentAccessories:Headset Microphone : 1 pcRecharger : 1 pcHost Machine : 1 pcWaistband ...