These are exactly as advertised. My wife's nose is wasted on being an accountant instead of sniffing out missing persons. She will notice if the car's ventilation system is musty when nobody else will. She will snivel if she rides in a car that was smoked in once after a bachelor party once, years ago, that has been smoke free ever since. The can has been full, in our conversion van for about a month now, and not a peep from her. My only surprise was that vevor didn't seem to sell a mount for it, but ebay rescued me there. I mounted it to my bike rack and drove fron Vermont to Mexico without incident. Thankfully I didn't need to call on the extra gas, but the peace of mind in remote parts of the country was priceless.