Medicament delivery device comprising an elongated housing comprising a grip member connected to the elongated housing and movable between a rest position in which the device has a predetermined grip size and an operation position in which the pre-determined grip size of the device is increased for providing an improved grip of the device during use. The zero valent material barrier layer can also enhance barrier to UV light. A latch bar includes an inclined latch end for engaging with the second side wall of the wedge block. The at least two coil assemblies are mounted to one of the housing and the shaft. The MAC address received in the address request is compared to the MAC addresses stored in the edge routers portMAC address resolution table. A comparison step is adapted to compare the characteristic quantity with a threshold quantity determined by a threshold quantity determination step.