The present invention relates to a medicament delivery device comprising a housing (10) arranged to accommodate a medicament container (18) filled with medicament a drive unit comprising a plunger rod (152) operable to act on the medicament container (18) a mechanical activation mechanism (182, 184, 186) configured to interact with the drive unit and wherein said mechanical activation mechanism is movable between certain predetermined states when interacting with the drive unit a recording unit (190) capable of recording status changes of said medicament delivery device including the status of the mechanical activation mechanism and detection elements (204) operably connected to said recording unit and positioned such as to detect when the activation mechanism has been moved between certain predetermined states.
