This compact personal humidifier with vapopads helps easy breathing and reduces the survival of flu viruses in your home by maintaining moisture level between 40-60 percent. the one button operation for constant cool mist output allows a simple and intuitive use. use with vapopads menthol or rosemary and lavender for additional soothing vapors and extra comfort. studies have shown that keeping indoor air at an rh level of 40-60 percent reduces survival of flu viruses on surfaces and in the air compared to lower rh levels.