About the App
Zheng YiBiao ("the App") is an on-device phone speed dashboard (V1.0). You can choose from multiple dashboard templates and, after granting location access, view live speed from system location services (km/h or mph), with Chinese/English UI and light/dark themes. The App does not offer trip logging, history, OBD, sensor panels, driving scores, sign-in, or cloud sync.
Last updated: September 8, 2026
Policy version: 2026.09.08
📌 In short: speed and location stay on device for the dashboard and are not uploaded to our servers. The App shows ads through Google AdMob (bottom banner and app open). The ad service may use the advertising identifier and may personalize ads.
1. Information We Collect
The App does not actively collect names, phone numbers, accounts, or other identifiers, and does not upload your data to any server.
Permissions (only if you grant them):
- Location (approximate/precise) — to read current speed via system location services (including GPS and network-assisted location) and show it on the dashboard. We do not record or upload trip routes or location history. Without permission you can still browse templates and settings, but live speed is not shown.
The App does not:
- Collect, upload, or share unrelated data such as trips, contacts, or your photo library
- Integrate our own analytics, push, or use speed/location for cross-app tracking. Advertising is provided by Google AdMob; see Third-party SDKs below
- Continuously sync speed or location data over the network in the background
- Use simulated speed or fake location data for display
2. Local Storage
The following is stored only on your device (e.g. SharedPreferences) to restore your preferences:
- Dashboard template and speed unit (km/h / mph)
- Theme (light / dark / system) and language (Chinese / English / system)
- Privacy policy viewed state (no agreement popup on the home screen), and the time of the last app-open ad (stored only on device to enforce at least a 3-minute gap)
The App has no registration, sign-in, or membership accounts. Uninstalling the App, or clearing its storage/data in system App info, removes this local data. You can open this Privacy Policy anytime from in-app Settings.
3. Third-Party SDKs and Advertising
The App integrates Google AdMob (Google Mobile Ads SDK) to show ads: a bottom banner fixed above the bottom navigation bar, and an app-open ad on first open and thereafter at least 3 minutes apart, whether you cold-start the App or resume it from the background. AdMob may process the advertising identifier (Android Advertising ID), device and app information, and ad interaction data, and where allowed by Google policy and local law this may be used to personalize ads. You can reset or limit the advertising identifier and opt out of ad personalization in system settings. The App does not send speed, trips, or location history to the ad SDK for targeting. Aside from advertising, it does not integrate our own analytics, push, map, or social SDKs. Showing ads requires a network connection to Google ad services.
4. Driving Safety
⚠️ Do not operate your phone while driving. Speed shown comes from system location and is for reference only; it does not replace factory instruments, road signs, or your own judgment. You bear the risks of relying on this display.
5. Children
The App does not knowingly collect personal information from children. Minors should use the App with guardian consent and supervision.
6. Policy Updates
We may update this policy when features or laws change. Updated versions ship with app releases and remain available under Settings → Privacy Policy.
7. Contact
For questions, permission withdrawal, or feedback, email lilinlin@bianzhenginfo.cn.
(Speed and settings stay on device; ads require a network connection. We respond only to emails you send proactively.)