The present invention relates to a device for delivery of medicament comprising a main housing; a container arranged in said housing and arranged to be connected to a medicament delivery member, wherein said container includes at least two chambers and at least one longitudinally movable plunger and wherein at least one chamber contains a medicament agent; a pre-treating arrangement acting on said container; drive force means acting on a longitudinally movable plunger rod capable of exerting a force on said container; and activating delivery means acting a said drive force means for delivering medicament via said medicament delivery member characterised in that said pre-treating arrangement comprises clickable means for manually and delay intermittently mixing said medicament agent and for manually priming said container.