An operation knob of an operating device for a vehicle is movably supported by an X-direction sliding unit and a Y-direction sliding unit. The housing has two oppositely located wall openings and a hand support surface with a thumb support assigned to each wall opening in the lightray treatment chamber. The initiator, upon actuation, acts to ignite at least some of the gas generant to form gas. A dispenser unit comprising a dispenser arrangement and an actuator, wherein the actuator is a piston is also disclosed.