Optimus 8" Reversible Twin Window Fan with Thermostat: * 8" * Reversible twin window fan with thermostat and LED * 3-speed rain-resistant motor for efficient air delivery * Automatically control by thermostat * Electrically reversible with LED temperature display * Pulls cool air in or exhausts stale air out * Built-in adjustable slide screens with lock * Two 8" plastic blades (6 paddles) * Fully assembled * No tools required for installation * Safety grill * UL US listed * White * 1-year warranty