The speed at which patient breathe in through their MDI matters and, if the most commonly prescribed inhaler (MDI) the patient and a healthcare professional, are probably doing it to fast. Inhaling to fast means effectively halving the amount of medication that should be reaching the patient's lungs. Patient is also at greater risk from unpleasant side effects from wasted medication.

2Tone is a handy device that trains patient to inhale at the correct speed. Patients using 2Tone quickly optimize their inhaler technique and benefit from a better quality of life.