We often use the headphone function of the phone a lot, so do you know that the headphone jack of the mobile phone has more functions than you think? Below are the important functions of the phone headphone jack.
Connect to microphone
Nowadays, many people like to use mobile phones to record their songs. While if recorded directly, the sound quality is not good.
So you can plug the external microphone directly into the headphone jack of the mobile phone to achieve better recording effect, and singing into the microphone is also very good.
Credit card can be connected
It turns out that the headphone jack of a mobile phone can connect to the card reader of a mobile phone. Once connected, you can insert your bank card and check the balance.
The potential for mobile applications in payments is almost unlimited. There is now a payment service called mPowa.
mPowa consists of a pre-installed smartphone application and a credit card reader. This device connects to the mobile phone via the headphone jack, or via Bluetooth.
When you clip a credit card to the device, it will scan the magnetic strip on the card and ask the user to enter a PIN into the phone to make the payment. But now this connection is not used by many people, instead it is used via the internet.
Connect to speaker
Many people like to use their mobile phones to listen to music at home, but the sound level is somewhat limited. To improve this, we just need to connect the speaker jack to the phone and we can play the song very loudly.
Khanh Son (Synthesis)
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