Abstract: The invention relates to a communication device (101; 102; 103) for controlling a system is provided, the communication device comprising a reflecting element (111; 112; 113) for composing a system control command, wherein the composed system control command is comprised of light reflected by the reflecting element (111; 112; 113). The invention further relates to a receiver (200) for receiving the system control command composed by and comprised of the light reflected by the reflecting element (101; 102; 103) of the communication device, the receiver comprising a sensing unit (210) for sensing the light reflected by the reflecting element and a processing unit (220) for retrieving the system control command based on the light sensed by the sensing unit (210).