A fluid pressure actuated device for establishing electrical contact includes a substrate defining a chamber, a flexible membrane having a first side facing a first direction away from the substrate and a second side facing into the chamber in a second direction opposite the first direction, and an electrically conducting contactor mounted on the first side of the flexible membrane. The flexible membrane extends and withdraws moving the electrically conducting contactor in the first direction and second direction respectively when fluid pressure is increased and decreased in the chamber. The flexible membrane includes at least two concentric frustum portions that narrow in opposite directions, including a central frustum portion and a second frustum portion that encircles the central frustum portion. Multiple chambers may be maintained in pressure equilibrium by at least one channel for the concurrent extension of multiple membranes and contactors.