·SIZE 4×10 INCH: Compatible with vent sizes ranging from 9⁷⁄₈"−10⁵⁄₈" in length, 3⁷⁄₈″−5¹⁄₂″ in width, and more than 2'' in depth; Measure vent openings before purchasing; This household booster fan is easy to install on floors, walls, or ceiling

·SMART TEMPERATURE CONTROL FOR ENERGY-SAVING : The VIVOHOME Register Booster Fan improves airflow from HVAC vents; The built-in thermostat turns the fan on/ off automatically based on your preset settings

·WI-FI APP CONTROL: Take command with the Wi-Fi app; Check and adjust your room's airflow from your phone; Set a schedule for automated comfort, or a sleep timer from bed; Use temperature history to make smarter settings; Total control, wherever you are

·SUPER QUIET & POWERFUL FAN: Powered by EC motor, the fan operates below 18 dB with high airflow up to 120 CFM; Fan only mode keeps the air flowing even after your ac shuts down at night; For undisturbed sleep, choose speed 1-4

·PERSONALIZE YOUR BREEZE: Direct airflow precisely with adjustable louvers (60°-120°) or opt for auto-swing for full room coverage; Even at rest, keep louvers open for ventilation, or closed to lock in treated air and savings

·SMART CONVENIENCE: Enjoy hassle-free operation with memory recall post-outage and child safety lock; Your temperature, speed, and louver angle settings are saved, and little hands can't change them

·DURABLE & STYLISH: Crafted from sturdy aluminum and ABS, this fan blends quality and compact style; Perfect for bedroom, attic, office, laundry, kitchen, or bathroom; For larger rooms, use multiple fans to ensure consistent comfort