Pioneer Amplifier and Graphic Equaliser, two seperate boxes which stack on top of each other and plug into each other. Amp makes a bit of a whining sound. Amp model is SA-940 and GE model number is SG-540. Any questions please ask. Please also see my other item for sale which is 2 Pioneer speakers that were bought at the same time as this. Collection only due to weight of the item. Both Amp and GE come in original packaging and boxes.