Portugal-World's First unusual stamp with LED issued in 2019

For the first time in the world, we have this issue from Portugal. The block has an attached LED diode that illuminates. An application on the smart phone is required to activate the LED and illuminate. Issue Christmas Oct 2019 year.

The souvenir sheet issue includes the image of the guiding star where a light emitting diode (LED) is located. The LED is activated through contact with an Android or IOS smartphone with NFC technology (near field communication).
To access this feature, follow these steps:
1- On an Android operating system, simply activate the NFC feature in the smartphone settings menu.
2- Move the back side of the smartphone close to the souvenir sheet.
3 - Find the area where the NFC frequency is being emitted to illuminate the star’s light (the LED).
1- On an IOS operating system, download an application from the Apple store that enables NFC communication. 2- To activate the NFC feature, you need to open the
downloaded application.
3- Move the back side of the smartphone close to the
souvenir sheet.
4 - Find the area where the NFC frequency is being emitted
to illuminate the star’s light (the LED).