SQD Motor - Silent & Energy Efficient, Water Store Protective Device - When the floater drops to the set low water level along with the fall of water level,the machine will automatically sends the water shortage alarm,and enable the humidification to be continuous without interruption. New-type Water Pump - The New-type water pump can be easily operated without abnormal sound, which can largely improve the time of humidification,and meanwhile, avoid the generation of jamming phenomenon during the oil puling water tank etc. , , Air Outlet With Super Wide Angle, Water tank Enclosed Design - The water tank is made of closed structure, which can effectively prevent dust in air,so it is safer &Healthier. Bio Chemical Cotton Filter Screen. Funnel Shaped Water Inlet Design.