Bluetooth

Bluetooth is a wireless technology standard that is used for transmitting data over short distances. This standard is widespread and used by a lot of devices like telephones, tablets, headsets, media players, game consoles, etc. The name comes from Harald Bluetooth, a Danish king from the last period of the 10th century.

Advantages

The technology is wireless
It's free to use
It is very easy to use and the connections are made almost automatically
There is little chance that interferences will occur, even if there are many devices around who use it
It has low energy consumption and uses a small processing power
It's supported by many devices

Disadvantages

The speed is not impressive
The security isn’t so good as other wireless technologies
The battery life will drop considerably if Bluetooth is always on
It has a low range, related to other wireless technologies

Components

Antenna/RF
Bluetooth Radio and Baseband
Bluetooth Software Protocol Stack

Versions

Bluetooth v1.0 and v1.0B
Bluetooth v1.1
Bluetooth v1.2
Bluetooth v2.0 + EDR
Bluetooth v2.1 + EDR
Bluetooth v3.0 + HS
Bluetooth v4.0