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What is Bluetooth?

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Quick answer

Bluetooth is a short-range wireless technology that lets devices talk to each other over radio waves — your phone to earbuds, a speaker, a smartwatch, or a car. It works over a few metres with no cables and no internet.

Key things to understand

  1. A short-range wireless link between devices.
  2. Uses radio waves — no cables or internet needed.
  3. Pairs earbuds, speakers, watches, and cars.
  4. Works over roughly 10 metres, on low power.

People also ask

How far does Bluetooth reach?
Typically about 10 metres for phones and earbuds, though newer versions and devices can reach further.
Does Bluetooth need the internet?
No — it's a direct device-to-device connection, so it works with no Wi-Fi or mobile data.
Why does Bluetooth drain battery?
It keeps a radio active to stay connected; modern Bluetooth Low Energy is designed to use very little power.