The Professional 800 is the quietest blender that operates at a sound level that wont interrupt. Housed in a sleek, sealed sound enclosure, it features the most advanced proprietary sound dampening and airflow innovations anywhereproving that industrial-strength power doesnt require industrial-strength noise. For the ultimate precision speed control, the Professional 800 features an 11-speed capacitive touch slider. Users can blend to the perfect consistency simply by sliding a finger up and down the control panel. The pulse button adds a burst of high-speed blending power all while keeping the noise level at a minimum.