Inhaler set

An inhaler set comprising:

• an inhaler,
• the inhaler being configured as a powder inhaler and having a housing with a delivery opening configured as a mouthpiece and having a plurality of air inlet openings, the plurality of air inlet openings including at least one first air inlet opening and at least one second air inlet opening;
• and
• powder to be inhaled stored inside the inhaler prior to discharge, said powder being atomized and being transported to the delivery opening by an air flow caused by inhalation from the air inlet openings to the delivery opening;
• and
• a sensor unit exchangeably attached to the inhaler for detecting the use of the inhaler,
• the sensor unit being attachable to the inhaler such that the at least one first air inlet opening is covered by the sensor unit in an attached state and the at least one second air inlet opening is not covered by the sensor unit in the attached state,
• the sensor unit comprising an inhalation sensor for detecting the air flow through the at least one first air inlet opening.