cold pressure it converts the essential oils into a dry mist as it preserves the therapeutic properties of the aroma oils. This is the perfect scent solution for small spaces with build-in fan for more evenly spread. Hypoallergenic and waterless diffuser. Safe for family & pets. Product features: Stand alone Wall mounted Multi-functional outside or inside HVAC unit Maximum decomposition of essential oil molecules through our signature Nano-technology Fully programmable cycle with digital display Automatic Start/Stop option Build-in FAN (optional use to improve diffusion) Nine fragrance intensity levels Ability to “multi-task” ? runs up to 3 different programs per day. For example: light in the morning, mild at noon, strong at night. Quiet operation with ultra-low energy consumption NO fragrance residue and NO damage to A/C units Specifications: Dimensions (W x H x D): 7.8 X 9.3 X 2.7 inches Wall mounted/portable/HVAC connection (small AC units) Security Lock for Fragrance Compartment