Infrared light is a wave with a frequency between the visible
and microwave and will travel in a straight line. Infrared is a type
of light, so it can not travel through opaque objects. The special
feature of infrared is a reflection on objects. The infrared data
communication that actually we are familiar with in everyday life
as well as use the remote control to the TV. Using infrared light,
so it is not suitable for the transmission of large amounts of data
and the limitations of the use of infrared light is no barrier to the
passage of light, and the transmission distance is not far away. It
is suitable for use within the same room.