How bluetooth works and how it got it's name. Have you ever wondered how your phone and headphones magically pair and don't get mixed with others using bluetooth. Well here's the answer:

1. Not that simple…

2. Communication
• Bluetooth communicates using
radio waves
• Not only is this not visible to our
eyes, it has such a long wavelength
that it can pass through walls just
like light passes through glass

3. Sending data
1. As most of the devices do, also
bluetooth uses 1s and 0s.
2. For example purple has a wavelength
of 121 mm, while green’s is 124 mm
3. If your device wants to send a 1 it
sends purple, if 0 than green
4. The microchip detects that and
writes done either 1 or 0
5. This happens about a million times a
second

4. Problems to this and
solutions
• But what if there are two bluetooth Airpods? Why
does the music not mix up?
• There are 79 different channels
• Each channel has its own specific wavelength with 1s
and 0s

5. What if there are
many… many devices
• Your Airpods are like locks. When you click the pair
button, it sends a key to the environment which can
be picked up by the phone
• After the phone finds the key, it pairs with the
AirPods and no one else can do so so even if a person
is in the same channel with you, they cannot hear
what you are hearing because the AirPods and phone
change the key every time and zero is sent.

6. Hard to sniff around
• There’s something called frequency
hopping
• Your phone and AirPods don’t stay at the
same place, they hop around channels and
this happens about 1600 times a second
• When your phone connects for the first
time, it sends a code telling where to hop
around

7. How it got it’s
name
• Credits to @Zachdfilms

8. Word of the day
Sniff around - investigate covertly, especially to find out information about someone or something,