A device includes a body. The body includes a cavity therein. A diaphragm separates the cavity from an environment surrounding the device to enclose a gas within the cavity. One or more extending members are attached to and extend outwardly from a surface of the diaphragm. The cavity resonates upon application of ultrasound energy thereto to cause movement in the diaphragm and the one or more extending members.

A micromechanical sensor element includes a substrate, a first structure movably arranged on the substrate, a second structure movably arranged on the substrate and an electrode arrangement, situated on the substrate in a fixed manner, which includes at least one first electrode. The movably arranged structures are coupled with each other by at least one coupling element in such a way that, upon a deflection of the first movably arranged structure along a first direction, the second movably arranged structure undergoes a deflection along an opposite direction. The first electrode includes a plurality of electrode surfaces. The movably arranged structures each include a plurality of movable electrode surfaces. The substrate-fixed electrode surfaces and the movable electrode surfaces engage with each other. The movable electrode surfaces are each situated on sides of the electrode surfaces of the substrate-fixed electrode arrangement facing away from the movably arranged structures.