Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Does not work in my car

Short of a full iPod integration kit which is $$$ and it's not quite there yet, technically, (at least for my car) I thought this device would work well. In my Mazda3 arm-rest box, there is a 12V outlet and an Aux input! regretably, the electrical humm from this device makes it unusable.