You are purchasing the QSC A2300 2-Channel Dual Power Amplifier Amp AS IS for parts and as described. Refer to pictures, I dont know how to test, although I did plug in and pushed POWER ON button, One chanel showed lights on, the other did not, may be something simple If I can help more let me know. Wish I could provide more info! Buyer pays $49 for USPS shipping in Continental US, For AK, or HA, or PR will Pay exact cost (heavy unit), Overseas OKAY through shipping, This unit as IS no returns. Read my Feedback I sell what I promise, This unit from Large ESTATE SALE in ILL, More items to come! Thanks for looking, We are Disabled Veteran business and Appreciate your patronage.