It the present invention relates to a kind of power supply group (10), and uses, is a kind of medicament delivery device, power supply group includes a plunger rod (12) can be along longitudinal axis L) Driving spring (36) is operatively coupled on the plunger rod (12) Sleeve (16 Plunger rod 66 82 100 120) setting holder (20,22 62,64 88,90 102,104 122,124) plunger rod (12) and the driving spring (36) are releasably held in and are in tension. The present invention is characterized in thatSignal initiation element (30 60 80 112 140) plunger rod (12) are set as With signal producing element (20,22 62,64 84,86 108,110 138) it is arranged to and cooperates, the signal initiation element (30 60 80 112 140) the related plunger rod of movement for the drug delivery devices that the information for providing 10 is supplied to user, plunger rod (12), when the sleeve (16 66 82 100 120) it has activated to discharge the holder (20,22 62,64 88,90 102,104 122,124 ).
