Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't rely on this device.

What a great idea, I thought. Well, today was the day I finally had the "chance" to use it. I left my headlights on and was relieved to know that I could just pull out this device and be on my way. No such luck! I followed the instructions exactly and IT SIMPLY DID NOT WORK. Nada, zip. Why is this product still on the market? And why did the latest Consumer Reports just report it as one model that actually works. It doesn't.