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 A Bluetooth connection has a number of interesting features that make our daily lives easier. 

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Infrared is a «line of sight» and almost always

a "one to one"

technology. 

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The big drawbacks of Bluetooth are that it is wireless,

inexpensive and automatic.

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It turns out that any two networks are on the same

frequency at the same time, the resulting confusion will only cover a tiny

fraction of a second. 

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Wi-Fi radios have no notable differences from other radios

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In any wireless networking

setup, security is not a problem at all.

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Each piconet

hops randomly through the available frequencies, so all of the piconets are

completely separated from one another.

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Some cities are trying to use WiFi technology to

provide free or low-cost Internet access to residents

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Security methods include

authorization and identification procedures that limit the use of Bluetooth

services to the registered user.