A housing can have two superposed housing members and a joint member connecting lips of the housing members to one another along at least a portion of a periphery. The housing members and the joint member can all be made of an elastomeric material, and thus be flexible, compressible, and have elasticity. An electronic unit within an air-filled cavity between the housing members can be received on a board, itself being received on one of the housing members, and having a press-switch unit covered by the other one of the housing members and forming part of a press-switch system.
