Has been in my work truck for about a week, Lights up when I close the door or start the engine, Works until I get out of the truck and doesn't have to with the moment of my initial full charge. The solar charging feature seems to be keeping it full so far. I like the temperature gauge for each tire as well as the pressure gauge. Seems VERY accurate. Considering buying another one for my car even though it already has a tire pressure warning. Definitely recommend this over others I've looked at, if only for the auto on/off feature. The sensors are a bit larger than I thought, but they aren't too noticeable.