The Evaporative Cooler Digital Controller automatically turns an evaporative cooler On/Off at you pre-programmed temperature setting. Room temperature is constantly displayed on the LCD (liquid crystal display) screen. To ensure that the cooler pads are fully wetted out before the blower engages, there is an adjustable 0, 2 and 4 minute, pre-wet cycle. All controls are concealed behind the attractive cover. For 115V (volt) and 230V evaporative coolers. Compatible with 1 and 2 speed motors from1/3 to 1 HP. Simple single touch temperature adjustment. Optional manual controls allow for low and high fan-only operation and pump-only pre-wetting.