This nebulizer is small, quiet and efficient. You can easily put it in your bag and take it anywhere, and the noise of the nebulizer machine is only 50dB. This small but mighty compressor nebulizer helps deliver medicine particles with an average size of 3μm, which have a greater probability to penetrate into the deep lung. We use a new mechanical structure, and add a microchip in the nebulizer, just to give you a quiet and comfortable experience. The proportion of 1-5 μm particles in the mist reaches more than 60%，so the mist can be absorbed efficiently by your body. Adjustable design makes nebulizer machine suitable for adults, the elderly, and kids. Patin’s exclusive Virtual Valve Technology produces particles as fine as 5 um MMD, ensuring optimum medication absorption even in the narrow branches of the lower airways. Noise Level: ≦50dB (1 meter away from Nebulizer) Weigh: 0. 55lb Dimensions: 6.1×3.85×3.77(inch) Power source: AC 100V~240V ,50Hz /60Hz Particle Size: MMADS ≦0.35µm±25% Average Nebulization Rate / Flow Solution: ≥0. 2ml/min Range of Operation Flow: 3 ~ 6 lpm Nebulization Pressure: 40KPa – 80KPa Maximum Capacity: 8ml Include: Mouthpiece x1Power Adapter x1Masks for adult x1 Masks for kids x1 Nebulizer machine x1 Nebulizer cup x1 Warranty 3-year warranty, no reason to return 30 days