Bluetooth

An introduction to Bluetooth - the revolutionary wireless technology that is included many of todays modern mobile phones.

• What is Bluetooth?
• Why the name?
• What is Bluetooth useful for?
• How does Bluetooth work?

What is Bluetooth?

Bluetooth is a short-range wireless technology used for connecting and transferring information between devices such as mobile phones, laptops, PCs, PDAs, printers, digital cameras, mice and keyboards. It's useful because it not only saves on messy cables but also allows you to easily synchronise information between devices.

Why the name?

Brief history lesson: The name Bluetooth comes from 10th Century Danish ruler, Harald Blatand, which means 'Bluetooth' in English (King Harald's nickname apparently came from his fondness for blueberries which he consumed in such a quantity that they stained his teeth a blueish colour). Just as King Harald united Norway and Denmark, the Bluetooth standard of today was created to 'unite' different devices! The Bluetooth 'B' logo is in fact a merger of two old Germanic runes for the letters H and B (i.e. Harald Bluetooth).

What is Bluetooth useful for?

Bluetooth allows for quick short-range transfer of pictures, audio files and messages between mobile phones and computers without the need for cables – phones and devices just need to be within 10-15 meters of each other. Instead of using a cable to transfer photos from your mobile phone to a laptop, with Bluetooth you can send them wirelessly.

It makes things like synchronizing the address book on your mobile, computer or PDA much easier. It also means you can have your computer in one room and connect it to your printer in another, so long as they are within range. Bluetooth technology isn't just about wireless file transfer – it has also revolutionised hands free kits and mobile phone headsets. Bluetooth stereo headsets are popular accessories for those who want to listen to music on the move.

How does Bluetooth work?

Bluetooth uses radio chips to transfer information. When one Bluetooth detects another, it automatically links up with it. It uses the 2.45 GHz radio band - the same one used by microwave ovens and cordless phones. Bluetooth devices constantly change the radio frequency they are using to prevent people from eavesdropping. Each device has its own ID which requires a PIN to authorize a connection with another device. However, once you have established the connection the devices can remember your details, which can be a security risk.

Most Bluetooth enabled mobile phones allow you to name your phone, search for other phones and Bluetooth devices in range, transfer pictures, music, messages or data between devices, and become invisible or visible to other devices.