It's a little big for a car according to me, so difficult to find an ideal place. The proposed fastening systems may leave traces on the dashboard and if I put it on the front passenger seat (we recommend a distance of 50 cm for optimum effect) are the rear passengers are harmed. Anyway, I still have not found the air conditioning unit for my car (since real aircon car turns out to be costly in time with the change of filters). It remains to test this camera for a more conventional use (office, bedroom). In any case it is seen to offer both options (cigarette lighter and sector). At this price we do not take big risks with this type of device so I would say in conclusion: to test. [Edit] First tests on the office sector: a bit noisy aircraft (so for a room is not great) but that keeps its promises: the air is refreshed and really a pleasant feeling. I must now immerse 6 small tubes (freeze) in the water supply for even more freshness. So I added a star to my rating ...