There Bluetooth technology it is the standard for short-range wireless data transmission between two devices, using radio waves. As we will see, it is a technology that was developed in 1996 and today it is still used for a huge range of applications, especially to connect our smartphones or computers with wireless earphones, amplifiers, keyboards, mice and many others electronic devices. But how exactly does this technology work? And why is it called that?
What is Bluetooth for and how does it work?
The Bluetooth is a technology that allows you to transfer or synchronize data between two compatible devices via waves radio, therefore wireless. Conceptually when we want to send a photo, for example, the phone reads it as a set of 0s and 1s and to be transmitted to your phone it is translated into radio waves. The waves arrive at the receiving phone, they come again converted to binary and then it is possible to see the starting image. The same goes if, instead of an image, we want to send a song: in this case the audio track is sampled at regular intervals, each is assigned a voltage and then converted into a series of 0s and 1s.
What's the difference between Wi-Fi and Bluetooth?
Bluetooth And Wifi they are two technologies conceptually similar but with different purposes: both in fact allow you to send And receive wireless information using radio waves. What changes is their goal: Bluetooth is used to connect devices to each other short distance and for usually for a short timewhile wifi is used to connect devices to Internet (via the router) to transfer data in a manner continuous, covering significantly greater distances than Bluetooth: let's also talk about 100 meters away. This is also why wifi has a transmission speed greater it's a major band.
To make a comparison, let's think of Bluetooth as a road made to connect two squares in a small village. It will be a small, two-way road, with a maximum speed of 50 km/h, because we don't need more. Wi-Fi would instead be a road to connect two distant cities: it would be a motorway, probably with 2 carriageways, 3 lanes for each carriageway, with a maximum speed of 130 km/h. Different objectives: different solutions maintaining the same principle.
From here we can also clarify another aspect: to use Bluetooth you don't need to have an internet connection.
Is it harmful to use Bluetooth devices close to the body?
The question to ask is how much of these the body absorbs electromagnetic waves. The measurement of absorption is expressed in HRH (Specific Absorption Rate). In the case of Bluetooth the SAR legal limit is 2W/kg and Bluetooth headphones usually have a value around 0.5, therefore below the legal limit. There are currently no studies demonstrating brain damage caused by long exposures to low SAR levels.
