Optimus 7 inch twin window contains a 2-speed rain resistant motor for efficient air delivery. Fan is manually reversible to pull cool air in or push stale air out and both sides contain speed control. Fan includes built-in slide screens to close in extra space on either side of the fan. Includes a carrying handle for easy transport and installation, plus feet for free standing operation. Fan comes fully assembled and ready to use, no tools required for installation. Safety grill to protect fingers from fan blades.