Adjustable valve technology in the medication reservoir ensures a particle size of up to 2.43 μm (MMAD). Compared to most medication containers on the market, the Rpssmax medication container offers much more efficient performance. MMAD ≤ 2.6 μm; Fine Particle Dose (FPD): 75-80%. Constant fine particle size for effective respiratory therapy. Patented adjustable valve in the medication reservoir (VAT). Mini-pump technology. Lightweight and portable. Extremely quiet. Very compact (6.3 x 6.4 x 15 cm). Mouthpiece and masks for adults and children. 12V adapter.