Allows precise humidity control with a 20%-90% range. Change from humidification to dehumidification with a flip of a switch. Controls a humidifier, dehumidifier or fan. Durable powder-coated steel enclosure will stand up to the toughest conditions. Grounded piggy-back cord is easy-to-use. Ventilation louvers help avoid water accumulation. Built-in 4% split differential. 15 Amps/120 V/60 Hz.