... Specifications:Operating without the use of batteries 5 colours for your choice,blue,purple,green,pink,orange Refill: ... . It can be diffuse by the return air system of air conditioning system,or it also can use the ... probably far away from the Windows and doors and air outlet, in order to avoid fragrance loss.2. ... . SBA-0131 Auto environmental perfume dispenser with air purifier fragrances/Aromatic column