Mic extension is used to support mixer that don't have enough port for more instruments. No electricity - just connect it to mixer using Jack cableextension is used to support mixer that don't have enough port for more instruments. No electricity - just connect it to mixer using Jack cable extension is used to support mixer that don't have enough port for more instruments. No electricity - just connect it to mixer using Jack cable extension is used to support mixer that don't have enough port for more instruments. No electricity - just connect it to mixer using Jack cable extension is used to support mixer that don't have enough port for more instruments. No electricity - just connect it to mixer using Jack cableextension is used to support mixer that don't have enough port for more instruments.