The Electrically Reversible Twin Window Fan with Bluetooth from Lasko allows you to control your fan with your smart phone. Two independently controlled motors for intake, exhaust, or air exchange. Easily adjust the brightness of the easy-to-read digital display. The included thermostat senses room temperature and turns fan on or off to maintain comfort. Features an electronic 8-hour timer and 3 quiet speeds. This window fan includes expanding side panels for a safe custom fit in double hung, casement, or sliding windows sized 24" to 32" wide and 12" high or larger. Comes equipped with the Lasko Blue Plug, trusted safety fuse technology. Fully assembled for window use