... 1.CE,ROHS,FCC,CB,ISO 2.Rechargeable battery 3.MP3 input 4.Suit for teacher, tour guide ,promo action ,army 5 ... voice amplified via speaker box . 2.Music amplifier :When connect the computer or MP3 with the ... the music volume could amplified by this mini amplifier box. We have other style that have ... request . Accessories : 1.Master amplifier 2.Wire microphone 3.Charger 4.Waistband 5.MP3 input cable6.Manual ...