"The AT401PM is a new addition to the desert cooling series. This model includes the 3-sided honeycomb cooling, a continuous water supply connection and built-in water overflow protection system*. The durable casters allow you to easily transport the cooler from room to room. This cooler provides excellent air flow to keep even larger rooms, including your den or semi-covered patio, cool and breezy. The AT401PE is an advanced version of the AT401PM, with added digital control panel and electronic features, including a full function remote control, optional low water alarm and automatic off timer for easy maintenance and added convenience"