Devices used in everyday life

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Also, let us consider one of the most popular devices that uses Bluetooth, this is 
a headset for your phone. Pairing it with the device does not require any additional 
applications, it is enough to have Bluetooth enabled on your phone. The headset is used 
to avoid holding your phone permanently in the hands while you are talking. It enables 
you to receive calls, transmits sound quality, securely fixed in the ear, it often has a 
function of effective noise reduction. Active Noise Cancellation System (ANC) cuts 
off all unnecessary sounds during a conversation, so your voice sounds clear. These 
devices remain popular today because of their low power consumption and small size. 
Figure 2 shows one of the popular Bluetooth headset models. 
Figure 7 - Bluetooth headset 
Nowadays, Bluetooth headphones are very popular. They can connect to both 
the phone and the computer. To pair with the device does not require additional 
applications, it is enough to have Bluetooth enabled. They have the same high quality 
sound as wired, but give full freedom of movement. Therefore, there are no problems 
associated with the presence of wires in the headphones, such as constant untangling 
headphones, breakage associated with broken wires. What is related to freedom of 
movement while using them, you can exercise freely and even swim if they are 
waterproof. Figure 3 shows one of the popular models of Bluetooth headphones. 

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Figure 3 – Bluetooth headphones 
Other popular devices are smart watches and fitness bracelets. These devices 
allow you to monitor your activity during the day. They also have a workout function, 
thus tracking your heart rate, speed and time of exercise, the number of calories burned. 
Many smart watches and fitness bracelets are waterproof, so you can exercise and 
monitor your swimming activity.
They also keep track of your sleep, its duration when you wake up, the phases 
of slow and fast dreams. Thanks to this, these devices can help you plan and follow the 
regime.
Due to the coronovirus pandemic, a feature has been added to some smart clocks 
that determines when you wash your hands. It includes a timer for 20 seconds, showing 
you the recommended duration. They may also remind you to wash your hands when 
you come home.
Also in some devices it is possible to remove the ECG (Electrocardiogram), 
which reads the duration and strength of electrical signals that occur during the 
heartbeat. 
To synchronize the data that the bracelet removes, you need to install a special 
application on your smartphone, which connects the smartphone and smart watch or 
fitness bracelet. The application will display an analysis of your activities. 
Figure 4 shows some of the popular smart watch and fitness bracelet models. 

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Figure 4 - Fitness bracelets and smart watches 
Other popular devices are wireless keyboards and mice for computers. They are 
powered by ordinary lithium batteries. To connect them to a computer you need a 
special Bluetooth adapter (connects to the computer via USB), as usually stationary 
computers do not have a Bluetooth module. Usually such adapters are included with 
the mouse and keyboard. These devices help remove the wires that go from your 
computer to your mouse and keyboard. Figure 5 shows these devices. 
Figure 5 - Wireless keyboards and mice 

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