Anti-Static Material designed to increase the effectiveness of drug delivery by reducing the electrostatic attraction of the interior surface. Ensures effective drug delivery with a built-in whistle alarm to alert patients when optimum inspiratory rate is exceeded. The one-way Valve opens easily to ensure accurate delivery without restricting airflow. The revolutionary design is pocket-sized for patient convenience while maintaining the effectiveness of MDI Chambers nearly twice its size. Fits all major metered dose inhalers.