Device for a medicament delivery device, which extends along a longitudinal axis and comprises: - a housing having a proximal and a distal end; - a medicament container arranged inside said housing, said medicament container comprising a medicament delivery member; - a medicament delivery member cover coaxially arranged and movable in relation to the housing; - a delivery member protruding adjuster operably connected to said medicament delivery member cover, characterised in that the device further comprises a signal generating mechanism arranged between the delivery member protruding adjuster and the medicament delivery member cover such that when the delivery member protruding adjuster is moved in relation to the medicament delivery member cover an audible and/or tactile and/or visual signal is generated for indicating that a certain delivery member protruding length has been set; - that the medicament delivery member cover together with the delivery member protruding adjuster are movable in relation to the housing from a first position in which the delivery member is surrounded by the medicament delivery member cover or by both the medicament delivery member cover and the delivery member protruding adjuster, to a second position in which the delivery member protrudes or is caused to protrude a certain length measured from the proximal end of the delivery member protruding adjuster; - said signal generating mechanism comprising first signal elements (38, 40, 44) arranged on the medicament delivery member cover and second signal elements arranged on the delivery member protruding adjuster such that the first and second signal elements will interact with each other when displacement of said delivery member protruding adjuster in relation to said medicament delivery member cover and thereby providing an audible and/or tactile and/or visual signal, and in that said first signal elements (38, 40, 44) comprise at least one flexing element (40, 44) flexible in a direction generally perpendicular to the longitudinal axis - wherein said first signal elements (38, 40, 44) further comprises at least one protrusion and said second signal element comprises a number of recesses, wherein, when said at least one protrusion is moved in position with one of the recesses, the flexing element (40, 44) will cause a sudden movement of the at least one protrusion into said recess, causing an impact, thereby providing a signal. - a housing having a proximal and a distal end; - a medicament container arranged inside said housing, said medicament container comprising a medicament delivery member; - a medicament delivery member cover coaxially arranged and movable in relation to the housing; - a delivery member protruding adjuster operably connected to said medicament delivery member cover, characterised in that the device further comprises a signal generating mechanism arranged between the delivery member protruding adjuster and the medicament delivery member cover such that when the delivery member protruding adjuster is moved in relation to the medicament delivery member cover an audible and/or tactile and/or visual signal is generated for indicating that a certain delivery member protruding length has been set; - that the medicament delivery member cover together with the delivery member protruding adjuster are movable in relation to the housing from a first position in which the delivery member is surrounded by the medicament delivery member cover or by both the medicament delivery member cover and the delivery member protruding adjuster, to a second position in which the delivery member protrudes or is caused to protrude a certain length measured from the proximal end of the delivery member protruding adjuster; - said signal generating mechanism comprising first signal elements (38, 40, 44) arranged on the medicament delivery member cover and second signal elements arranged on the delivery member protruding adjuster such that the first and second signal elements will interact with each other when displacement of said delivery member protruding adjuster in relation to said medicament delivery member cover and thereby providing an audible and/or tactile and/or visual signal, and in that said first signal elements (38, 40, 44) comprise at least one flexing element (40, 44) flexible in a direction generally perpendicular to the longitudinal axis - wherein said first signal elements (38, 40, 44) further comprises at least one protrusion and said second signal element comprises a number of recesses, wherein, when said at least one protrusion is moved in position with one of the recesses, the flexing element (40, 44) will cause a sudden movement of the at least one protrusion into said recess, causing an impact, thereby providing a signal.