TESTING & COSMETIC NOTES: This is a USED WORKING item in GOOD cosmetic condition that IS THOROUGHLY TESTED and is GUARANTEED WORKING This unit lights up and powers on. Unit was tested and outputs loud and clear sound through test speakers. (1) - QSC ISA 300TI PROFESSIONAL POWER AMPLIFIER TWO-CHANNEL 300W 4 OHM RACKMOUNT AMP. In the rare situation that this is not the case, we will send a replacement upon safe return of the original item within 30 days of receiving the item.