This is a small DC hour meter. They say it's rated for 8 to 80 volts so those of us using standard 12 volt (or 24 volt) cars won't have a problem. The connection is easy. Behind are racks for 2 petal connectors. I plugged it into the console next to my boat's ignition key. It helps me keep track of engine hours so I know about service intervals. The meter comes with a rubber gasket and a plastic frame. It works well and the price is pretty good.
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