Applications of wireless technology

Security systems
Wireless technology may supplement or replace hard wired implementations in security systems for homes or office buildings.

[edit] Television remote control
Modern televisions use wireless (generally infrared) remote control units. Now radio waves are also used.

[edit] Cellular telephony (phones and modems)
Perhaps the best known example of wireless technology is the cellular telephone and modems. These instruments use radio waves to enable the operator to make phone calls from many locations world-wide. They can be used anywhere that there is a cellular telephone site to house the equipment that is required to transmit and receive the signal that is used to transfer both voice and data to and from these instruments.
refrence:http://en.wikipedia.org