Radio waves are a type of electromagnetic radiation with wavelengths longer than infrared light. Like all other electromagnetic waves, they travel at the speed of light. Artificially-generated radio waves are used for fixed and mobile radio communication, broadcasting, radar and other navigation systems, satellite communication, computer networks and innumerable other applications. Did you know that radio waves travel so much faster than sound waves that a broadcast voice can be heard sooner 18,000 km away than in the back of the room in which it originated?
Check out posmicro.com if you are looking for a receipt printer



