Air Alert: app that notifies about danger in certain region in your smartphone

It's already available in Google play and AppStore.
No registration, no personal data or geolocation collection. App sends extremely loud notifications about air raid, chemical, technogenetic or other types of alert of civil defence even if your phone in soundless or sleep regime.
In order to receive notifications:
1. Set up app in Google Play or AppStore.
2. Allow it to send you notifications and warnings.
3. Choose region you want to receive alerts about.
4. Follow start and end of air alert.
You can change region or disable notifications whenever you want.
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Hotel guests are obliged to keep the 1.5 meters distance.
Online check-in making in advance is recommended to avoid queues at check-in to hotel.
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Self-serve is not allowed.