The all new Mattress Cooler lets you sleep cool all night long without worrying about huge electric bills. Features: 66% Larger 2.5L Water Tank Quieter Operation Upgraded cooling fan and circulation pump Added ability to cycle fan on/off while pump keeps running Upgraded remote (batteries not included) Removable/Washable in line filter Water Based Cooling: The Mattress Cooler uses evaporative cooling to chill water 7-12 degrees below room temperature. The chilled water is then circulated through a thin cooling pad to pull away excess body heat trapped between your mattress and blanket. Sleep Better: The Mattress Cooler provides direct cooling exactly where you need it...between your mattress and your blanket. Cooling Pad Technology: Our cooling pads excellent thermal properties provide cooling at temperatures up to 78F while cotton pads require temperatures in the low 50's to start feeling cool. Save Electricity: The Mattress Cooler is not a complete air conditioning replacement...your AC is still needed to keep temperatures and humidity reasonable. However, using a Mattress Cooler will allow you to set your thermostat at about 76F from 8PM-8AM instead of 66, saving you thousands of Kwh every year. Depending on your use, the Mattress Cooler could easily pay for itself in just a few months. Mattress Cooler Large Topper Pad 55"x63"- Black