Abstract: A cap assembly adapted to removably attach to a medicament delivery device is presented having a longitudinally extending cap body configured to be removably attached to a proximal end of the medicament delivery device; an electronic component associated with the cap body; a power source associated with the cap body and configured for powering the electronic component; a resilient member associated with the cap body and configured to establish an electrical connection between the power source and the electronic component, wherein the cap body can have a movable member configured to interact with the resilient member and with a component of the medicament delivery device such that when the cap body is attached to the medicament delivery device, the resilient member is prevented to establish the electrical connection between the power source and the electronic component.