1-5 μm nebulized particles, Adjustable nebulization rate: 0.15ml/min~0.90ml/min to meet different needs of patients. Two nebulization modes to choose: surge® mode & variable frequency mode. Convenient, efficient for adults & children. Built-in rechargeable battery for continuous use (up to 60 minutes) after fully charged. Small & highly portable for carrying around. Detachable medication cup for better cleaning purpose. FREE CLINICAL SPO2 INCLUDED