Permanent memory - programming, time and date are not lost during a power outage | copy function - allows for quicker programming and 7-day programming allows for separate programming for each day | programmable fan - delivers better indoor air quality when combined with an aprilaire whole home air cleaner | product dimension: 15.0"l x 10.0"w x 16.0"h | aprilaire humidifiers provide maximum comfort throughout your entire home - every hour, every day, all season long, without the mess and inconvenience of portables. Heating your indoor air dries out your skin. This not only makes you feel itchy but can also make you feel chilly. This cold effect is not the only discomfort caused by too dry air. Annoying static electricity is another indication of low humidity levels. Proper relative humidity (rh) will reduce this discomfort.