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   Bluetooth's FAQ

FAQ about Bluetooth Technology

How does Bluetooth work?
Bluetooth technology works by sending low-power radio waves.

What frequency does Bluetooth use to operate?
This technology communicates on the unlicensed industrial, scientific, and medical (ISM) frequency of 2.4 to 2.485 GHz.

What other devices use this radio-frequency band?
Baby monitors, garage-door opener, and the latest cordless phones all use the same ISM band, like Bluetooth technology, to operate.

How does Bluetooth prevent interference?
A Bluetooth device prevents interfering with other devices on the same frequency band by sending very weak signals of about 1 milliwat. To put the in perspective, a cell phone can transmit a signal of 3 watts.

How far does Bluetooth mobile signals travel?
The Bluetooth mobile signals travels 10 meters or 32 feet. This prevents it from interfering with signals that other household devices, such as your TV or cordless phone, transmits.

How Can I Set-up Bluetooth?
To enable Bluetooth, you need to set up your electronic devices so they can communicate with each other. Find out more on how to do this by clicking here.

How many devices can I hook up with Bluetooth?
Bluetooth allows users to connect eight of their gadgets simultaneously. All these gadgets must be within 10-meter radius to communicate with each other.

What is the spread-spectrum frequency hopping?
Bluetooth uses the spread-spectrum frequency hopping technique to limit more than one Bluetooth device from transmitting on the same frequency.

How often does Bluetooth switch frequencies?
Bluetooth switches frequencies 1, 600 times every second, so more and more of Bluetooth-enabled devices can make use of the limited section of the radio spectrum.

What's a piconet?
Piconet or personal-area network is what Bluetooth system creates to communicate with other Bluetooth devices. Once a piconet is created, users or devices can randomly, but in synch with each other, hop frequencies to avoid other Bluetooth piconets nearby.

What is the operating range for different Bluetooth devices?
The operating range solely depends on the device class, for an example:

  • Class 3 radios – can send signals up to 1 meter or 3 feet
  • Class 2 radios – generally used in mobile devices – have a range of 10 meters or 32 feet
  • Class 1 radios – generally used in industrial cases – have a range of 100 meters or 300 feet

Is Bluetooth technology secure?
Read our Bluetooth security article to find out how secure this technology really is.

 
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