Isolates 2 quadrants at once, providing tongue and cheek retraction. Dual-vacuum controls allow better control of moisture and humidity throughout the oral cavity. Suction evacuates 6 liters per minute. Removes 1.94 liters of water per minute; removes 4.6 cu. ft. of air per minute. Strong, ultralightweight titanium control head. Weighs 2-1/2 oz.