I've had to jump on my car and even my lawn mower multiple times. That was a real lifesaver! A bit awkward to charge just because the charging plug is small and recessed. It seems expensive for what it is, but really worth it if you think you're going to need it. I travel a lot and really feel better knowing I have something this reliable in my car. This thing works with both a residual charge and a dead battery. It's really neat technology that I think is unique to this product. You can disconnect the battery to start the car if you really need to, but this is not recommended. But it's nice to know that when you really need it, you can start the car with a working battery or not. Understand how it works before you need to use it so you don't waste time trying to figure out an emergency.
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