P3

Infrared light is a type of electromagnetic radiation. Its 

wavelength is longer than that of visible light, making it invisible to the naked eye unless special equipment and filters are used. Infrared Cameras

3G is the third generation of wireless technologies. Is is used so you can access the internet wherever you are and you do not need to be connected to WI-FI

Bluetooth is used so you can play you music out load on your phone and you can also use headphones and play your music wireless it also means you can send other people videos pictures and music through Bluetooth

SMS : Short message (or messaging) service, a system that enables cellular phone users to send and receive text messages.

GPRS: satellite signals if can help you find where you are and can give advise how to get to your destination like a sat nav 

   Protocols