... power and a total of 2 wireless microphones, this great system is ideal all your needs including fitness & dance classes ... PA Speaker with Casters USB SD MP3Mobile and active PA system with 12" (30cm) bass driver and 100W amplifier power45W ... , play) *Teaching, Conference, classroom, military training, guide, sales promotion, public sale's loudspeaker recorder play. *Pageant, congregation, make a speech ...