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.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. Equipped with a 4.8 liters water tank and water level indicator, this air cooler will keep you cool throughout summer. Diligent engineering and premium material of this cooler for home helps create a low sound operation to let you sleep peacefully on hot summer nights. This energy-saving cooler uses only 50 watts (approximately). Unwind this summer without breaking the budget or worrying about power cuts. 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.