This is one of the safest car diffuser on the market and has excellent scent throw and a small modern design.
Air vent clip-ons are simple, yet effective. Filled with a liquid perfume, these car air fresheners clip onto the folds of a car’s air vent. As the air passes over and through the clip-on, it draws molecules from the liquid up and out of the device. The amount of time these last depends on how frequently they are exposed to moving air from the air vents. Warm air also causes them to get used up much faster.
Car diffusers should not be left in high heat environments exceeding 30C for extensive periods of time.  If fragrance products are kept in high heat environments, the fragrance can expand and cause leakage out of bottle.
Clean up spills immediately. Diffuser base and fragrance oil can damage (but not limited to) surfaces like plastics, polished/varnished surfaces and wood