Airwick mist ultrasonic aroma atomiser.

This isn't a new concept. There was a very small unit called Wisp that worked the same way but used a smaller bottle of more concentrated aroma and put out very tiny wisps on a regular basis. This unit is somewhat more generous in the amount of aroma chemical it puts out.
It uses an ultrasonic disk sitting on a wick to create a fine plume of aromatic mist, and when turned on it silently squirts out regular puffs of aroma into the air. From the point it is turned on it runs for 8 hours and then sleeps for 16 to conserve aroma and battery life.
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