• What are the compatible smartphones?

    The mobile application is supported on iPhones from iOS 7 and above, and on Android from 4.0.2 and above.

  • Does the app and the PS Sticker work worldwide?

    Wherever your smartphone is covered with at least a GSM cellular service Private Sentinel and the Sentinel Network can assist our users.

  • What can the service do if I am in an area with poor signal or even no data connection?

    Our multiple channel alerting (SMS, email, social, groups and Sentinel Network) is a complex and robust system, that is managed by the Private Sentinel servers.

    If there is only GSM cellular service available, the mobile application sends all the necessary information encrypted in an SMS to the Private Sentinel server which then decodes the message and starts the same multiple channel alerting. So our users don’t have to be concerned about data connection when in trouble.

    A working and reliable data connection is ideal for the tracking functions though.

  • Battery consumption

    The background services of the application will not drain considerably the battery of the phone.

    Between the devices we are using Bluetooth BLE 4.0 standard to keep energy consumption low. The users’ phone will not start any communication towards the companion device unless it is required by the PS Sticker while an alert activation is under process.


  • Who can use the PS Sticker?

    We are primarily focusing on women and lonely people, but statistics show us such a companion device is quite useful for anyone without differentiating by gender or age.

  • How to avoid accidental alerts started by the PS Sticker?

    We have tested several situations with our focus groups and figured the most trusted way is the rapid double press on the PS Sticker.

    Within a 10 second time frame our users can deactivate the alert before it reaches the predefined contacts,

    group members and the Sentinel Network.

  • Does the app contact to emergency services or authorities?

    In some countries the Private Sentinel Call Center solution supports such services.

  • Who knows my position, am I tracked all the time?

    The decision if they let group members see their exact position is on our users.

    When Invisible Mode is turned on, only the Private Sentinel backend services will track a user’s position. These datas are encrypted and fully kept in secret. It is important to understand, that logging out or force the background tasks to stop can affect the efficiency of the assistance in case of an outgoing alert. If the backend services are lack of the user’s position, Private Sentinel will not be able to effectively notify the predefined contact persons, group members and the Sentinel Network.

  • How do you use my personal data?

    Privacy is our highest concern. We retain our users’ location information only for alerting purposes. After 24 hours previous position data is wiped off from our database. We are always using the latest available and best proved security solutions to keep our users data private and safe.

  • Data usage

    Users’ positions are sent regularly to the PS server in the background.

    These background services require approximately 3-4 MB data usage / month.

  • Do I have to pay for the SMS messages?

    Our users with a valid subscription don’t have to pay for those text messages which are sent to the predefined contact persons. An alert which is activated with no data connection will generate a single text message which is sent to the Private Sentinel servers. This SMS message might have extra costs based on your mobile operator’s service plan.

  • Do I need to replace, or recharge the battery in the PS Sticker?

    There is no need to change the battery in the PS Sticker. We designed it waterproof and to last for a year, so our users don’t have to care about battery replacement or regular charging.

    The mobile application will notify the user if the battery level is getting low.

  • Is the PS Sticker waterproof?

    Yes the PS Sticker is designed to meet the IP67 certification standards. It is resistant against water ingress to a maximum of 1 meter for up to 30 minutes.

  • What is the communication range of the PS Sticker?

    The PS Sticker uses bluetooth low-energy (BLE) to communicate with the mobile application.

    The range depends on the environment (indoor can be less, outdoor can be more), but an average estimation is ~15-50 meters.

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