Last updated: May 18, 2026
Effective date: From the official release date
Developer name: ddHiFi
Company name: Guangzhou DD Electronics Technology Co., Ltd.
Contact email: support@ddhifi.com
This list explains the types of personal information, purposes of use, and collection scenarios that may be collected and used by the ddHiFi Link Android App, ddHiFi unified account center (accounts.ddhifi.com), ddHiFi official website, after-sales service, product support portal, and ddHiFi-related business systems authorized to access the unified account center when providing services such as registration, login, account management, authorized access, product connection, PEQ configuration, firmware update, feedback, after-sales support, and security protection.
This list forms part of the Privacy Policy. If this list is inconsistent with specific page prompts or special authorization notices, the more specific page prompt or special notice shall prevail.
1. Account Registration, Login, and Authorization
| Information Type |
Specific Information |
Purpose of Use |
Collection or Use Scenario |
Sensitive Personal Information |
| Account identification information |
ddHiFi account ID, username, registration time, account status |
Create accounts, identify users, provide unified login service |
Registration, login, account management, authorized login |
No |
| Contact details |
Email address, mobile phone number |
Registration and login, account identification, account recovery, account security verification, necessary service notifications |
Email registration, account login, account profile maintenance, unified account center authorization return |
Mobile phone number may be sensitive personal information |
| Identity credentials |
Password, access token, refresh token, login session, authorization code, App SSO login ticket |
Identity verification, maintaining login status, authorized access, token refresh, preventing forged requests |
Password login, SSO authorized login, App deep-link callback, token refresh, logout |
Passwords, tokens, and login tickets are high-risk information |
| SSO binding information |
SSO service provider identifier, user unique identifier returned by a third party or the unified account center, binding time |
Complete unified account login, account creation or binding, prevent duplicate binding and account impersonation |
User logs in to ddHiFi Link or other connected systems through the unified account center |
May be sensitive or high-risk information |
| Authorization request information |
Client ID, callback URL, authorization scope, state parameter, region parameter, login status identifier |
Complete OAuth2/SSO authorization process, prevent forged requests, return authorization result to App |
App initiates SSO login, account center returns login result |
No |
| Terms confirmation information |
Terms acceptance time, terms version, page prompt confirmation status |
Record the user’s confirmation status for the terms of service and privacy policy |
Registration, login, continued use of service, or when page confirmation is required |
No |
2. Account Profile Management
| Information Type |
Specific Information |
Purpose of Use |
Collection or Use Scenario |
Sensitive Personal Information |
| Basic profile |
Nickname, avatar, personal bio |
Display account profile, identify account, display for PEQ configurations or comments |
User center profile maintenance, SSO authorization return, PEQ configuration and comment display |
No |
| Personal preferences |
Title, identity type, language preference, region preference |
Provide localized experience, distinguish service regions, display personalized profile |
App settings, account profile maintenance, authorized login |
No |
| Birthday information |
Birthday |
Account profile display, age judgment where necessary |
User center profile maintenance |
May be sensitive personal information depending on the specific use scenario |
| Binding status |
Email binding status, mobile phone number binding status, SSO binding status |
Account security verification, account recovery, login method management |
Binding, unbinding, account profile synchronization |
Mobile phone number and account binding identifiers may be sensitive or high-risk information |
3. ddHiFi Link App Local Data
| Information Type |
Specific Information |
Purpose of Use |
Storage Location or Scenario |
Sensitive Personal Information |
| Encrypted login session |
Login status, user ID, nickname, email, avatar, access token, refresh token, token expiration time, language and region |
Maintain login status, refresh sessions, reduce repeated login |
App local encrypted storage protected by Android Keystore |
Yes, high-risk information |
| Local preferences |
Language, region, interface or feature preferences |
Provide localized experience, save interface or feature selections |
App local preferences |
Usually no |
| Device operation settings cache |
Device identifier or cache key, LED status, gain setting, filter setting, operating mode, selected EQ |
Restore device configuration experience, reduce repeated settings |
App local storage; some settings may be synchronized as device preferences after login |
Depends on whether device identifiers are associated with an account |
| Local PEQ files |
Configuration name, description, frequency points, gain, Q value, filter type, preamp gain, save time, file path |
Save, apply, and delete local PEQ configurations |
App local file directory |
Usually no; may be personal information if the configuration name contains personal information |
| Downloaded files and cache |
Downloaded PEQ files, firmware files, product image or manual cache, application cache |
Provide offline or quick access, complete firmware upgrade, reduce repeated downloads |
App cache or local file directory |
Usually no |
4. Product Connection, Device Control, and Firmware Updates
| Information Type |
Specific Information |
Purpose of Use |
Collection or Use Scenario |
Sensitive Personal Information |
| USB connection information |
USB authorization result, device connection status, device interface and endpoint status, supported device identification result |
Identify and connect supported ddHiFi USB devices, complete device control |
App startup, device insertion/removal, user authorizes USB access |
Usually no |
| Product and firmware information |
Product model, product name, firmware version, chip or device status, upgrade mode status |
Display device status, query OTA configuration, complete firmware upgrade, troubleshoot issues |
Connecting device, reading device status, entering firmware upgrade process |
Depends on the specific device identifier and account association |
| Device configuration parameters |
Volume, gain, microphone gain, LED status, operating mode, filter type, PEQ parameters |
Complete device configuration initiated by the user, save or restore settings |
User adjusts device parameters in the App, saves to device or locally |
Usually no |
| Firmware files and upgrade records |
OTA configuration, firmware file URL, release notes, download status, upgrade result or error information |
Provide firmware updates, display version history, troubleshoot upgrade issues |
Query OTA, download firmware, perform firmware upgrade |
Usually no |
5. PEQ Configurations, Comments, and Interactions
| Information Type |
Specific Information |
Purpose of Use |
Collection or Use Scenario |
Sensitive Personal Information |
| PEQ configuration information |
Configuration title, description, product model or product UUID, PEQ file URL, configuration type, status, creation/update time |
Save, display, download, and manage user or official PEQ configurations |
User saves to cloud, views official or public configurations, backend management |
Usually no; may be personal information if the title or description contains personal information |
| PEQ file content |
Frequency points, gain, Q value, filter type, preamp gain, and other audio parameters |
Generate, upload, download, and apply PEQ configurations |
Local save, direct upload to Tencent Cloud COS, cloud configuration download |
Usually no |
| Interaction information |
Likes, dislikes, favorites, download count, rating, comment content |
Display configuration popularity, manage comments and user interactions |
User browses, favorites, comments on, or downloads PEQ configurations |
Comment content may contain personal information |
| Display profile |
User nickname, avatar, user ID |
Display PEQ author, commenter, or favorite relationship |
PEQ configuration list, details, comment area, backend management |
No |
| Operation IP |
IP address when creating or updating PEQ configurations, comments, or favorites |
Security audit, anti-abuse, dispute handling |
Submitting, updating, or deleting PEQ-related content |
IP address is personal information |
6. Feedback, After-Sales, and Service Support
| Information Type |
Specific Information |
Purpose of Use |
Collection or Use Scenario |
Sensitive Personal Information |
| Feedback content |
Issue description, suggestion, contact details submitted by user |
Handle App feedback, contact user, improve products and services |
App feedback page |
Depends on content entered by user |
| Feedback associated account information |
User ID, username, nickname, email, mobile phone number, avatar |
Identify feedback submitter, backend review and feedback handling |
Logged-in user submits feedback, backend feedback management |
Mobile phone number and email may be relatively sensitive information |
| App and device information |
App version, version number, phone manufacturer, phone model, Android system version |
Compatibility judgment, troubleshooting, issue scope assessment |
When user submits App feedback |
Usually no |
| After-sales service information |
Product model, order number, purchase proof, repair or warranty description, shipping address, contact person, contact details |
Handle after-sales applications, warranty, repair, returns and exchanges, customer service |
Submitted through official website, after-sales service system, or manual customer service |
Address and contact details may be sensitive personal information |
7. Notifications, Security Verification, and Audit Logs
| Information Type |
Specific Information |
Purpose of Use |
Collection or Use Scenario |
Sensitive Personal Information |
| Login security information |
Login IP, User-Agent, login time, login failure count, temporary lock status |
Prevent account theft, credential stuffing, malicious login, investigate security risks |
User or administrator login, login failure, token refresh |
IP address and User-Agent may contain personal information |
| Session information |
Session ID, refresh token hash, previous refresh token hash, expiration time, revocation time, last use time |
Manage login status, refresh tokens, prevent token replay |
Login, refresh, logout, account cancellation or security handling |
Yes, high-risk information |
| Administrator security information |
Administrator account, name, mobile phone number, position, MFA status, MFA secret, login IP, login alerts |
Backend management, security verification, abnormal login alerts |
Management backend login, MFA settings, administrator management |
Mobile phone number and MFA secret are high-risk information |
| SMS, email, or verification code information |
Mobile phone number, email address, verification code, sending result, verification result, human verification parameters |
Send verification codes, complete registration and login, account recovery, sensitive operation verification, prevent API abuse |
Only when relevant services are actually enabled in the account center or specific pages |
Mobile phone number and verification code are sensitive or high-risk information |
| System operation logs |
IP address, request time, API path, error information, service status, operation logs |
Ensure service stability and secure operation, troubleshoot issues, conduct security audits |
Service API access, system exceptions |
IP address may be personal information |
8. File Uploads, Product Materials, and Basic Services
| Information Type |
Specific Information |
Purpose of Use |
Collection or Use Scenario |
Sensitive Personal Information |
| File upload information |
File name, file type, file group, object storage key, upload URL, public access URL |
Generate Tencent Cloud COS direct-upload policy, save product materials, PEQ files, avatars, or firmware files |
Backend uploads materials, user uploads PEQ configuration files |
Depends on file content |
| Product material access records |
Product model, manual URL, product image URL, FAQ or product support link, OTA configuration query conditions |
Display product materials, provide manuals, FAQ, and firmware version information |
App service page, device page, firmware page |
Usually no |
9. Device, Network, and Access Records
| Information Type |
Specific Information |
Purpose of Use |
Collection or Use Scenario |
Sensitive Personal Information |
| Device and browser information |
Device model, operating system, browser type, language setting, User-Agent |
Page adaptation, troubleshooting, account security, risk identification |
Website access, login, registration, account management, feedback submission |
Usually no |
| Network and access records |
IP address, access time, accessed API or page, referrer page, network status, error information |
Website and service operation, security protection, troubleshooting, service optimization |
Website access, API calls, App network functions |
IP address is personal information |
| Cookies and local storage |
Session cookie, region preference cookie, necessary login status identifier, backend management token local storage |
Maintain login status, identify region preference, ensure normal service operation |
Accessing account center, official website, management backend, or other web services |
Depends on specific content |
10. Information the Current App Usually Does Not Actively Collect
Unless a specific service page provides a clear separate notice or you voluntarily submit such information to us, the current ddHiFi Link Android App usually does not actively collect the following information:
- System permission data such as precise location information, contacts, call records, SMS content, calendar, photo album, camera, and microphone recordings;
- Financial or real-name identity information such as payment accounts, bank card numbers, and identity document numbers;
- Personal file content unrelated to ddHiFi product connection, account login, feedback, PEQ configuration, or after-sales support;
- Advertising identifiers used for advertising or cross-App tracking, or third-party analytics SDK data.
Please note that if you voluntarily enter the above information in feedback, comments, PEQ configuration titles or descriptions, or after-sales materials, we will process such information within the scope necessary to handle the corresponding request.
The above content is a translated version. In the event of any conflict with the Chinese description, the Chinese version shall prevail.
