A drug delivery device capable of working in at least two different modes which includes a dose injection mode and a set-up mode. The drug delivery device automatically changes from the dose injection mode to the set-up mode and vice versa in accordance with the detection of the cover by a cover detection switch. In the dose injection mode doses can be set and injected; in the set-up mode various parameters assisting the use of the drug delivery device can be set. This setting is preferably done by selecting the parameters from a menu, also in this mode historical data stored in the device can be viewed.