The present invention relates to a recording unit arranged to be connected to a medicament delivery device, which recording unit comprises a generally elongated housing (10； 90) having dimensions so as to enclose at least a distal part of the medicament delivery device (50), the recording unit comprising a recording mechanism (60； 120) provided with an electronic circuit (64； 134) and arranged at a distal end inside said housing, said electronic circuit comprising an activation element (40； 108) operably arranged to activate said electronic circuit (64； 134) when said medicament delivery device is inserted in said housing, said electronic circuit (64； 134) comprising sensor elements (80； 140) capable of sensing status changes of said medicament delivery device during use.
