The present invention refers to an injection device comprising a housing (5) with a receptacle (2) for the product, a dosing mechanism for setting a product dosage to be administered and for displaying the set product dosage and a dispensing mechanism for dispensing the product. The dosing mechanism comprises a dosing sleeve (50) which is rotatable relative to the housing (5) in a first direction for setting a product dosage and which is rotatable relative to the housing (5) in a second, opposite direction for correcting or dispensing a product dosage. The dispensing mechanism comprises a piston rod (8), which is moveable relative to the housing (5) in a dispensing direction in order to eject the set product dosage in a dispensing stroke corresponding to the set product dosage, at least one sleeve (7； 40), which is rotatable together with the dosing sleeve (50) relative to the housing (5) in the second direction in order to eject the set product dosage, and a clutch (60) interposed between the dosing sleeve (50) and the at least one sleeve (7； 40) and rotatable with the dosing sleeve (50) and/or the at least one sleeve (7； 40). The device further comprises at least a first detector (21) for detecting movement of the clutch (60) relative to the dosing sleeve (50) and/or the housing (5) and/or the at least one sleeve (7； 40) and a data processing unit (20) connected to the first detector (21) for reading, storing, processing, transmitting and/or displaying signals received from the first detector (21).
