Particle size created by the VAT bottle is around 2.19 μm (MMAD), tested by Cascade Impactor and 3.221 μm tested at Dv(50) by Malvern Spraytec. Compared to most bottles in the market, the proprietary bottle ensures more efficient and effective performance. - MMAD ≤2.2 μm; Fine Particle Dose (FPD): 80-85% - Consistent fine particle size for efficient respiratory treatment - Patented Valve Adjustable nebulizer bottle (VAT) - Powerful Piston compressor - Mouthpiece and masks for adult and child included - Built-in Compartment for Accessories