I purchased 2 of these humidifiers for son and mother. They both have allergies living in the San Joaquin Valley. My son has been using his daily while home as well as leaving it on all night. Cool shape, light to move to where you want it. Both my son and mother hardly cough anymore at all. A great feature on these is they go off if water gets low and great safety feature. They honestly appear to be a teardrop nightlight. Works and can't beat the price!!! :)