Battery-operated portable 50-watt multimedia stereo amplifier with 3 mic inputs, line in with separate volume and tone controls, line out. The S805A works with most microphones including condenser dynamic and wireless. The condenser (electret) input includes phantom power. All 3 mic inputs can be used simultaneously. Tape record mixed multimedia presentation as it is happening or provide a mixed output to the room's built-in sound system that control. Connect (with optional Y-jacks) up to four speakers. Power with 10 alkaline D-cell batteries.