I just plugged it into my car's cigarette lighter and it immediately shows the current battery voltage and temperature in the car. Product 5 stars. I have ordered 2 of these. Both show the inside temperature in red. One of them shows the battery voltage in green and the other in blue. I'm taking off a star because the seller doesn't allow color choices when buying from Amazon. To me, the blue display looks cooler, but the green display is definitely easier to read.
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