Just wanted to say, I ordered a refurbished amplifier on Ebay from seller - OEMAUTOAUDIO. I was very skeptical buying this OEM refurbished amp. The amp came with the sellers phone number to help with trouble shooting and installation. I assume you have to buy from him to get his number and advice that goes with the product purchase. This guy quoted trouble shooting approx 5000 of this Lexus OEM type amp. This guy was extremely helpful and the refurbished am was in great shape. Highly recommended!