A compliance monitoring module for an inhaler comprising: a miniature pressure sensor, a sensor port of said sensor being configured to be pneumatically coupled to a flow channel of said inhaler through which a user can inhale； a processor configured to: receive data from a sensing element of the pressure sensor； receive data from a mode sensor configured to detect when the inhaler changes from an inactive mode to an active mode； and based on said data from said pressure sensor sensing element and said data from said mode sensor, compile a compliance report； and a transmitter configured to issue said compliance report.
