Sensor measuring distance using sound waves.
Sensor measuring distance using sound waves.
Sensor measuring distance using laser pulses.
Sensor measuring distance using time of flight.
Sensor using light for measurement or detection.
Hardware detecting infrared signals.
Semiconductor device producing laser light.
Semiconductor device emitting visible or infrared light.
Light-sensitive transistor.
Semiconductor device detecting light.
Everything is a system, and every system contains systerms.