Feel refreshed and alert everywhere you drive! This amazing device can be mounted on your dashboard or windshield. Just plug it into your car's cigarette lighter or runs on 4 AA batteries (not incl). Virtually maintenance-free -- simply pull out the collection rods and wipe clean. When parked, a blinking red LED simulates a car alarm to warn off thieves. This unit is just slightly larger than a pack of cigarettes, but don't let this little life saver fool you! You can almost smell that fresh, clean air now!