According to one embodiment, a displacement control member may be operationally coupled with a selectable button of a hazard detector so that axial depression of the selectable button effects pivoting of the selectable button and the displacement control member into contact with a switch of the hazard detector. The displacement control member may be coupled with the selectable button so that a ratio of a distance from the switch to a point of user contact with the selectable button and a distance from the switch to a pivot point of the displacement control member is similar regardless of where the user contacts the selectable button. The displacement control member may equalize a user input force that is required to activate the hazard detector's switch.