When I opened the box I thought it was a real POS. 3 inches square, additional volume control, instructions don't make much sense, POS right? I was wrong. I guessed a bit hooking it up, soldered greased and shrink wrapped all the connections. Turned it on and nothing happened...just as I expected. I pushed the polarity button and it came on. What a surprise. Good sound with just the amount of boost I was looking for. The small size takes no room inside the centre console. The additional volume control is not needed. I am impressed. Great value for the money.