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Title: Great for the price!
Review: I first looked into these types of products because I bought better ones (Kim Hotstart) for diesel engine-generator sets that I manage, but didn't want to spend >$100. I found the build quality to be surprisingly good (but not great) on these and was pretty easy to install. I measured the cord length and mine was only 3.5' (advertised as 4')and just barely reaches the grill on my car.Just a quick note for anyone who may be concerned that 60/80W is too much for the battery at certain times of the year. I had this same concern (briefly). Look for a dimmer extension cord for lamps that will allow you to throttle down the power if you think you need to. Also, you should realize that the temps under your hood during operation are going to be much more than the highest temp that these things will reach just sitting there warming. I measured mine with an infrared thermometer at 115 deg F max (surface of the pad).
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