This is the mattress pad with an internal system that continuously circulates cool water at your preferred temperature so that you can sleep comfortably. Water is pumped through soft, flexible silicone tubing within the pad to help eliminate night sweats and restlessness that can deprive you of a sound slumber. More energy efficient than cooling an entire room and more targeted than a fan, the mattress pad has dual zones (except twin) that enable bedmates to independently control the temperature on each side using the included wireless remote controls. The pad's temperature can be adjusted in one-degree increments down to 46º F (or warmed to 118º F). The pad's dual cooling units operate quietly and have a 12-hour timer that automatically turns the pad on and off, ensuring that your bed is already cool the moment you slip under the covers. Cooling units plug into AC with 8' cord; each remote requires 2 AAA batteries. Pad can be machine washed and dried. Cooling unit 7" H x 12" W x 11" D.