An embodiment of the present invention pertains to an electronic device such as a passive matrix display, an alpha-numeric display, a detector array, or a solar cell array. The protective pocket includes cooperating first and second lightweight fabrics, and an opening for receiving the object. The heater works to elevate the temperature of the gas sensor element up to a given value required to bring the gas sensor element into an activated condition. If the duty ratio Dt is equal to or greater than a predetermined reference value DJ, the displacement is permitted to be varied corresponding to the duty ratio Dt. The invention provides means to accelerate liquid molecules to substantially equal velocity, and then to release them with minimal turbulence. Said aim is achieved by providing a transmission device including an electric motor provided with a rotor, a planetary gear provided with at least one sun gear, and a shaft arrangement, the rotor being coupled in a rotationally fixed manner to the sun gear by the shaft arrangement.