1. Introduction
The SinoTrack ST-902 is a compact and efficient GPS tracking device designed for vehicles. It plugs directly into your vehicle's OBD-II port, providing real-time location tracking, historical route playback, and various alerts. This manual provides detailed instructions for setting up, operating, and maintaining your ST-902 GPS tracker.

Image: The SinoTrack ST-902 GPS tracker shown alongside a smartphone displaying its real-time tracking capabilities on a map interface.
2. Safety Information
- Ensure the device is securely plugged into the OBD-II port to prevent accidental dislodgement.
- Do not attempt to disassemble or modify the device. This may void the warranty and cause damage.
- Keep the device away from extreme temperatures, direct sunlight, and moisture.
- Only use a 2G GSM SIM card with this device. Other SIM card types (3G, 4G, CDMA) are not supported.
- Always prioritize safe driving. Do not operate the tracking platform or app while driving.
3. Package Contents
Verify that all items are present in your package:
- 1 x SinoTrack ST-902 OBD GPS Tracker
- 1 x User Manual (this document)

Image: The SinoTrack ST-902 GPS tracker, its retail packaging, and the included user manual.
4. Specifications
| Feature | Description |
|---|---|
| Operating Temperature | -20°C to 55°C |
| Operating Humidity | 5% to 95% Non-condensing |
| Network | GSM/GPRS (2G only) |
| GSM Chip | Quad Band GSM 850/900/1800/1900Mhz |
| GPS Chip | UBLOX7020 |
| GPS Sensitivity | -159Db |
| Location Accuracy | 10 meters, 2D RMS |
| Time Accuracy | 1 microsecond time synchronization of satellite time |
| Battery | Built-in 180mAh / 3.7V (for temporary power) |
| Interface | OBD standard 16-pin interface |
| Dimensions | 5.3 x 4.5 x 2.2 cm |
| Weight | 113.4 g |

Image: The SinoTrack ST-902 device showing its dimensions and key features like real-time tracking, history playback, and various alarms.
5. Setup Guide
5.1 SIM Card Requirements
The ST-902 requires a 2G GSM SIM card with GPRS data capabilities. Ensure the SIM card has sufficient balance for SMS commands and data usage. 3G, 4G, or CDMA SIM cards are not supported.
5.2 SIM Card Preparation
- If your SIM card has a PIN code enabled, insert it into a mobile phone and disable the PIN code. The tracker cannot read SIM cards with active PIN codes.
- Ensure the SIM card is active and can make/receive calls and access mobile data.
5.3 Inserting the SIM Card
Locate the SIM card slot on the side of the ST-902 device. Insert the prepared 2G GSM SIM card into the slot with the metal contacts facing down and the notched corner oriented correctly. Push until it clicks into place.
5.4 Device Installation
The ST-902 is designed for simple plug-and-play installation. Locate your vehicle's OBD-II port, typically found under the dashboard on the driver's side. Simply plug the ST-902 device firmly into the OBD-II port. No wiring or additional tools are required.

Image: A hand demonstrating the simple plug-in installation of the ST-902 into a vehicle's OBD-II port.
5.5 Initial Configuration (APN and Server Settings)
Before using the online tracking platform, you must configure the device's APN (Access Point Name) and the platform server IP/port via SMS commands. This information is specific to your SIM card provider and the SinoTrack platform.
Common SMS Commands:
- Set APN: Send SMS command: APN,your_APN_name# (e.g., APN,internet# for some providers)
- Set APN User/Password (if required): Send SMS command: APNUSER,your_APN_username# and APNPASS,your_APN_password#
- Set Server IP and Port: Send SMS command: SERVER,104.243.132.242,8000,0# (This is a common SinoTrack server, verify with SinoTrack support if different)
- Check Device Status: Send SMS command: RCONF# (This will return the current configuration, including APN and server settings).
Note: Replace "your_APN_name", "your_APN_username", and "your_APN_password" with the actual details from your SIM card provider. The server IP and port should be confirmed with SinoTrack's official documentation or support.
6. Operating Instructions
6.1 Accessing the Tracking Platform
The SinoTrack ST-902 utilizes the official SinoTrack tracking platform, accessible via web browser or mobile application.
- Web Platform: Visit www.sinotracker.com and log in using your device's ID (usually the IMEI number) and default password (often 123456, change after first login).
- Mobile App: Download the "SinoTrack Pro" app from the Apple App Store (for iOS) or Google Play Store (for Android).

Image: The SinoTrack tracking platform interface displayed across various devices including a laptop, tablet, and smartphone, highlighting its multi-platform accessibility.

Image: The SinoTrack Pro mobile application interface, demonstrating real-time vehicle tracking and the geofence setup feature.
6.2 Real-Time Tracking
Once logged in, you can view the current location of your vehicle on the map. The device updates its position periodically, providing real-time tracking data.

Image: A screenshot of the SinoTrack web platform displaying real-time tracking of a vehicle on a map, with speed and location details.
6.3 History Route Playback
The platform stores historical tracking data for up to 2 years. You can review past routes and activities by selecting a date range and playing back the route on the map.

Image: The SinoTrack Pro mobile app interface demonstrating the history route playback feature, showing a vehicle's past movements on a map with speed and signal strength indicators.
6.4 Alerts and Alarms
The ST-902 supports various alerts to notify you of specific events:
- Movement Alarm: Notifies you if the vehicle moves from a parked position.
- Over Speed Alarm: Triggers if the vehicle exceeds a predefined speed limit.
- Shock Alarm: Alerts you to unusual vibrations or impacts to the vehicle.
- Low Battery Alarm: Notifies you when the device's internal battery is low.
- Leaving Alarm (Geofence): Alerts you if the vehicle enters or exits a designated geographical area (geofence).
These alerts can typically be configured through the web platform or mobile app settings.
7. Maintenance
- Keep the device clean and free from dust. Use a soft, dry cloth for cleaning.
- Ensure the device remains securely plugged into the OBD-II port.
- Regularly check your SIM card balance and data plan to ensure continuous tracking service.
- Periodically check for firmware updates on the SinoTrack official website or through the app, if available.
8. Troubleshooting
| Problem | Possible Cause / Solution |
|---|---|
| Device not showing online on platform. |
|
| Device not responding to SMS commands. |
|
| Inaccurate location data. |
|
| History route playback is incomplete or missing. |
|
9. Warranty and Support
For warranty information, please refer to the terms and conditions provided at the time of purchase or contact your retailer. SinoTrack offers customer support for technical assistance and inquiries.
If you encounter any issues not covered in this manual, please contact SinoTrack customer service through their official website or the contact information provided with your purchase.
Important Note: This device supports 2G GSM networks only. Please confirm your local network supports 2G before purchase and use. If 2G is not supported in your region, consider the ST-902W 3G tracker model.