Cross Valve TechnologyTM is designed to provide very low resistance, one-way flow during inhalation for improved drug delivery and ease of use.; Transparent Chamber allows clear visualisation of respiratory valve movement and direct confirmation of correct product operation and usage by patients.; dishwasher-safe.; Universal inhaler (foals Song) base has an elastic opening that fits perfectly with all metered dose inhaler (MDI) brands and does not easily dislodge during removal of inhaler (foals Song).