The 7 in. Twin Window Fan offers versatile cooling day and night. Use it on exhaust mode during the day to expel heat and create a refreshing indoor breeze, and switch to intake mode at night to draw in cool air. It fits most window types and sizes, with expander panels for a custom fit. No tools are required for installation, and it comes fully assembled. With two speeds and snap-on feet for floor or table use, it's energy-saving and easy to operate by simply plugging in. Additionally, it features a safety grill to protect fingers.