OnZai (AnZai) Privacy Policy

1. Introduction

Welcome to OnZai (Life Guardian, hereinafter referred to as "this application"). We value your privacy, and this Privacy Policy explains how we collect, use, store, and protect your personal information.

2. Information Collection

2.1 Types of Information We Collect

Device Information

• Device unique identifier (Device ID)
• Device name
• Operating system platform (iOS/Android)
• Device model and system version

Sensor Data (Processed Locally, Raw Data Not Uploaded)

• Pedometer data: Step count, activity history (48-hour historical records)
• Accelerometer data: Body micro-movements and activity levels
• Audio data: Audio signals collected through microphone (for abnormal sound detection)
• Location information: Used for Wi-Fi-based vital signs detection (only used when the application is running)
• Device interaction data: Screen unlocks, app usage, and other digital footprints

User Settings and Configuration

• Emergency contact information (name, phone number, relationship)
• Monitoring sensitivity settings
• Notification preferences
• Language preferences

User Baseline Data (for Personalized Monitoring)

• Sleep time
• Average breathing rate
• Average heart rate
• Interaction frequency

Network Function Related Data

• Network contact information (other users added through QR code scanning)
• Push notification tokens (Expo Push Token)
• Online status and last active time

Alert and Notification Data

• Risk scores and alert records
• Alert notification status

2.2 Methods of Information Collection

• Direct collection: Information you actively provide when using the application, such as emergency contacts (stored locally)
• Automatic collection: Data automatically collected through device sensors and system APIs
• Server synchronization: Data synchronized with servers (device registration, network contact synchronization, alert notifications)

3. Purpose of Information Use

We use the collected information for the following purposes:

• Vital signs monitoring: Non-contact vital signs monitoring through multi-sensor fusion algorithms
• Anomaly alerts: Sending alert notifications when potential anomalies are detected
• Emergency contact: Automatically contacting your designated emergency contacts in emergency situations
• Network alerts: Sharing alert information with network contacts you add (only after you actively add network contacts)
• Personalized services: Providing personalized monitoring services based on your baseline data
• Application functionality: Providing core application features including monitoring, alerts, contact management, etc.
• Service improvement: Analyzing application usage to improve service quality (using anonymized data only)

4. Data Processing and Storage

4.1 Local Processing

• Sensor data: All sensor data (audio, accelerometer, pedometer, etc.) is processed and analyzed locally on the device
• Audio analysis: Uses local TensorFlow Lite model (YAMNet) for audio classification; raw audio data is not uploaded to servers
• Risk score calculation: All risk score calculations are completed locally on the device

4.2 Local Storage

Using AsyncStorage to store locally on the device:

• User settings and configuration
• Emergency contact information
• Pedometer historical data (48 hours)
• Monitoring status and risk scores
• User baseline data

4.3 Server Storage

The following information is synchronized to our servers (AWS EC2):

• Device registration information (Device ID, device name, platform)
• User ID and registration time
• Push notification tokens (for sending push notifications)
• Online status and last active time
• Network contact relationships (only after you actively add network contacts)
• Alert notification records (for alert sharing among network contacts)

5. Information Sharing and Disclosure

5.1 We Do Not Sell Your Personal Information

We do not sell, trade, or rent your personal information to third parties.

5.2 Information Sharing Circumstances

We only share your information in the following circumstances:

• Emergency contacts: When high-risk situations are detected and you do not respond, we will send alert information (including risk level, time, etc.) to your designated emergency contacts
• Network contacts: If you have actively added network contacts (through QR code scanning), these network contacts will receive alert notifications when you trigger an alert
• Service providers:
  • Expo: For push notification services (Expo Push Notifications)
  • AWS: For server hosting and data storage
  • Google Firebase: For Google Play service integration (if applicable)

5.3 Legal Requirements

We may disclose your information when required by law or to protect our rights, property, or safety.

6. Permissions

This application requires the following permissions to provide core functionality:

• Location permission: For Wi-Fi-based vital signs detection
• Microphone permission: For sound monitoring and abnormal sound detection
• Activity recognition permission: For pedometer functionality and activity monitoring
• Camera permission: For scanning QR codes to add network contacts
• Phone permission: For calling emergency contacts in emergency situations
• SMS permission: For sending SMS to emergency contacts in emergency situations
• Storage permission: For saving application data and configuration
• Notification permission: For sending push notifications and alert reminders

You can revoke these permissions at any time in your device settings, but this may affect certain features of the application.

7. Data Security

We take the following measures to protect your data security:

• Local encryption: Sensitive data is encrypted and stored locally on the device
• Secure transmission: Encrypted connections for server communication (HTTPS recommended for production environments)
• Access control: Server data is limited to authorized access only
• Data minimization: Only collect and use necessary data

Please note: While we take reasonable security measures, no data transmission or storage system is 100% secure.

8. Data Retention

• Local data: Stored on your device until you uninstall the application or manually clear data
• Server data: Retained until you delete your account or uninstall the application, or as required by law

9. Your Rights

You have the right to:

• Access: View your personal information we have collected
• Correct: Correct inaccurate personal information
• Delete: Request deletion of your personal information (by uninstalling the application or contacting us)
• Withdraw consent: Revoke application permissions in device settings
• Data export: Request export of your data (if applicable)

10. Children's Privacy

This application is not intended for children under 13 years of age. We do not knowingly collect personal information from children under 13. If we discover that we have collected such information, we will delete it immediately.

11. Third-Party Services

This application uses the following third-party services:

• Expo: Application framework and push notification services (Expo Privacy Policy)
• Google Firebase: Google Play services (Google Privacy Policy)
• AWS: Cloud server hosting (AWS Privacy Policy)

These third-party services have their own privacy policies, which we recommend you read.

12. International Data Transfers

Your data may be transferred to and processed in locations outside your country/region. We ensure appropriate security measures are taken to protect your data.

13. Privacy Policy Changes

We may update this Privacy Policy from time to time. Significant changes will be notified to you through in-app notifications or email. Continued use of this application indicates your acceptance of the updated Privacy Policy.

14. Contact Us

If you have any questions, comments, or complaints regarding this Privacy Policy, please contact us through the following:

• Application Name: OnZai (AnZai)
• Package Name: com.lifeguard.app
• Contact: guli@tsinghua.org.cn

15. Legal Disclaimer

16. Consent

By using this application, you agree to the terms of this Privacy Policy. If you do not agree, please stop using this application.

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