A display window assembly is mounted in the opening of a bezel of a housing, and a force is exerted against the assembly by a suitable resilient element urging it outward through the opening. A movement permitting portion is formed on at at least one of the lock member and the rail attaching the lock member so that the relative movement between the lock member and the rail attaching the lock member in the rail axis direction is allowed with the lock member locking the relative movement. The fluid flows in a substantially unidirectional flow substantially within the muffle. The device further includes a base plate provided with a first electric contact. The method further includes providing, based on the leadership score, an invitation to be sent to the individual, inviting the user to assume a leadership role associated with the online group. This architecture offers the minimal extension resistance as well as minimum lateral diffusion for better CMOS device scaling.