Loud signal that turns on even in silent mode

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loud siren;
ability to remotely disable silent mode;
view the latest photos on your child's phone;
eye protection;
night mode.
Smartphones it works on: Android, iOS.

Subscription costs: from 99 to 2249 rubles.

"Parental Control: Locator"
The service ensures safety and monitors the movements of private group members. You can create geofences, limiting safe and dangerous places on the map.

Parents must install two applications: on their smartphone - Kid security, and on their child - Sirius chat.

Advantages:

"Sound Around" function to hear what is happening near the child;
setting a limit on games;

emergency notification;
lots of useful entertainment for children.
Smartphones it works on: Android, iOS.

Subscription costs: from 99 to 2990 rubles.

"Connected: Family Locator"
GPS tracker for tracking the movements of relatives and friends. One mailing lists by zip codes person downloads the locator, registers in any convenient way and becomes an administrator. When he creates an account, he will be able to connect everyone else to the account.

Advantages:

creating safe zones;
sending geolocation and SOS signals;
monitoring battery level;
driving speed reports.
What smartphones does it work on: Android, iOS.

How much does a subscription cost: from 149 to 5190 rubles.

More on this topic
How to share geolocation: on Android and IPhone