Ultra-quiet UL-certified AC-powered fan designed to cool various electronics and components. Features a multi-speed controller to set the fans speed to optimal noise and airflow levels. Dual-ball bearings have a lifespan of 67,000 hours and allows the fans to be laid flat or stand upright. Turbo power adapter increases maximum fan speed and enables the fan to be powered through an AC outlet. Fan Size: 4.7 x 4.7 x 1 in. Airflow: 65 CFM Noise: 18 dBA Bearings: Dual Ball