Aerosol sprays diffuser very large particles that drop to the ground the moment they are sprayed, providing very high concentrations just in the area they were sprayed. The scent effect is very short and can’t be controlled. Ultrasonic diffusers use water and vibration to diffuser very tiny amounts of essential and aroma oils. With AroMini BT, there is no diluting in water or other carrier oils are required. The scent particles diffused suspend for several hours providing the most subtle and comfortable scented environment. AroMini BT creates, maintains and evenly delivers a perfectly balanced scented environment continuously and in low dosage without alcohol, water, propellants or other harmful VOCs.