Subject: How is infrared communication used in the world today?

Dear Sir or Madam: 

My name is Michelle Lemire and I am a senior physics student at Overfelt 
High School in San Jose, California. Iam hoping you might be able to help 
with a question.

My partner and I are building an electronics device for class. Our project 
specifically is a device that consists of two boards; the first contains a 
microphone and the second a speaker. The device allows one to speak into 
the microphone and the voice waves are changed into a beam of infrared 
light. the light is beamed across to the second board, wher it is received 
and changed back into voice waves, which are then transmitted through the 
speaker for one to hear. 

I am having some trouble researching the uses of this device and real-
world devices that are similar to what we are constructing. If you could 
give me some information about early prototypes of similar devices or 
about modern-day devices that work like ours, it would be appreciated.
 
If you are not able to help or are not able to refer me to someone who 
might have some information, please contact me at: iam1230@hotmail.com 
Thank you for your help and time! 

Sincerely, 

Michelle Lemire 

Re: How is infrared communication used in the world today?