I have one also I bought it used. I tried it out for a 3-4 days. It worked fine but my car didn’t like it in the early cold mornings on my way to work. I’ve had a electrical gremlin for a year now that only in the early cold mornings, my volt light will flash on the highway sometimes when I hit a bump or sometimes at the stoplight. Anyways that’s another story but if you’re interested I have a volt booster and I’ll sell it for what I paid for it $50.