Handheld Nebulizer YS30 Product Dimension:45*61*121mm Color of Main Unit:White Color of Medicine Bottle:Grey Product Weight (Without Battery):74g Particle Size:2-5μm Vibration Frequency:120±10%KHz Nebulization Rate:�0.25ml/min Working Nosie:�21dB Supply Power:2''AA'' Akline Batery; USB Cable Assembly Type Between Main Unit and Medicine Bottle:Flip Type Different Function:20minutes Timing Function; The Device work 20 minutes than stop automatically. Zhengyuan is one of the leading nebulizer manufacturer. Our handheld nebulizer, Handheld Mesh Nebulizer, Medical Nebulizer, Low Power Medical Nebulizer has high quality and competitive price, welcome to contact us.