Bionaire BW2300 Twin Window Fan with Remote Control With a remote control for convenient adjustment, this double window fan draws in fresh, cool air from the outside or exhausts stale, hot air from inside. It can also do both simultaneously, because each of the two fans can be set independently to draw in or exhaust out, allowing the unit to exchange inside and outside air. Operable either manually or automatically--with its thermostat turning the fans off and on to maintain a selected temperature--the unit has three speeds, electronic controls, and an LCD screen showing the selected temperature and the room temperature. The remote control (2 AAA batteries not included) alters speed, manual/automatic operation, air-flow direction, and temperature. he twin fan is designed to fit double-hung, vertical-slider, and casement windows. A built-in 7-inch extender and two 3-inch extenders permit custom fitting for windows from 24 to 37 inches wide. Because the unit is lightweight plastic it can be moved easily from room to room. The fans have six blades and measure 8-1/2 inches in diameter. Overall, the unit is 13 inches high, arrives fully assembled, and carries a five-year warranty against defects. Window fan - Designed for use in most double-hung and slider windows. 3 Speed Settings with Remote Control Remote controls power, speed, thermostat, and airflow direction from up to 15 feet (4.5 meters) away. Built-in Adjustable Extender Screen exapnds to fit larger windows and slider safe extender panels offer rigid support for vertical orientation. Electrically Reversible Airflow Control Change the direction of the blades to intake fresh cool air, exhaust hot stale air or exchange for full room circulation; Water resistant motos are also UL approved and safe to use when raining. Programmable Digital LED Thermostat Set your desired temperature level to the degree from 60-80 degrees and the fan will automatically turn OFF and ON in response to the ambient room temperatuer! Also visible in the dark for nighttime use. Remote Control Feature Remote control operation provides the ultimate in convenience, allowing use of three speed settings - high, medium, and low speed for controlled airflow and optimal cooling and comfort. (2 AAA Batteries 1.5V required - not included).