A digital thermostat is a convenient way to control your MasterCool ducted evaporative cooler. This MasterStat digital thermostat is designed to operate a 2 fan speed motor, water pump motor, and water purge pump (optional). It has a backlit LCD display which makes reading temperatures easy. In case of a power outage, this thermostat stores your last active control settings so your cooler will not need to be reprogrammed. The pre-wet mode ensures the media pads are fully saturated prior to the pump being activated. Minimal wiring is required when installing this thermostat into your existing outlet box. A rain proof control box is included for your convenience. MasteStat is a registered trademark of Champion Cooler Corporation. WARNING: This product can expose you to chemicals including benzene which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.