I ordered this with an Alpine INA-W910 from a reputable online/catalog retailer that begins with a "C".When I was ready to test out the system, I plugged the harness into my car and within a few minutes the GMOS-04 became VERY hot to the touch. In addition, the sound would not come through the speakers. I called tech support for where I purchased it and they said it sounded like a faulty unit. They quickly sent me another one and it worked perfectly.If there are any other options, I would like to know, as the quality seems pretty poor; it is just a circuit board that rattles around in a chunky plastic case.To all of those who complain about the chime noise, the nice feature is that you can totally turn off the volume.