A lens unit has an opening to incorporate first and second movable lens frames at a side other than an image side and an object side. A sensor for determining the pollutant concentration is placed at a second position, downstream of the first position, in the exhaust-gas system. A plurality of spaced-apart adhesive pads are defined within the adhesive layer. The notification is transmitted to the target mobile station over a secondary connection. The plurality of chain-engaging teeth includes at least three upshifting facilitation teeth configured to facilitate upshifting. The control circuit automatically implements, and at a number of different occasions for a number of different, naturally varying heart rates, so that the memory contains information indicating the stroke volume as a function of the heart rate.