1. Introduction
This user manual provides comprehensive instructions for the SinoTrack ST-905L 4G GPS Tracker. Designed for vehicles such as cars, motorcycles, trucks, and taxis, this device offers real-time location tracking, anti-theft features, and a strong battery for extended use. Please read this manual carefully to ensure proper setup, operation, and maintenance of your GPS tracker.
2. Product Overview
2.1 Key Features
- 4G LTE Network: Supports 2G and 4G networks for reliable connectivity.
- Voice Monitor: Allows listening to the sound around the tracker.
- Real-Time Tracking: Access location information via SMS, mobile App, and web platform with accuracy up to 5-10 meters.
- History Route Playback: View and playback daily tracking history.
- Durable Design: Waterproof, dustproof, and shockproof.
- Strong Battery: Built-in 5000mAh Li-ion battery with standby up to 15 days.
- Powerful Magnetic Attachment: Features 5 strong magnets for easy, no-installation mounting.
- Lifetime Free Platform: Utilizes the SinoTrackPro tracking platform for lifetime use.
2.2 Product Components
The package includes:
- SinoTrack ST-905L GPS Tracker Unit
- Charging Cable
- User Guide (this manual)

Figure 2.1: SinoTrack ST-905L GPS Tracker and tracking interface on a smartphone.

Figure 2.2: Product dimensions and key features including real-time tracking, history playback, waterproof, geo-fence, overspeed alarm, shocking alarm, sleep mode, remote listening, and built-in 5000mAh battery.

Figure 2.3: The package contents, including the GPS tracker, charging cable, user manual, and a storage pouch.
3. Setup Guide
Follow these steps to set up your SinoTrack ST-905L GPS Tracker:
3.1 Activate SIM Card
- Purchase a local 4G (LTE) SIM card. Ensure it supports call, text, and internet functions.
- Insert the new SIM card into your mobile phone to activate it and remove any PIN code.
- Once activated and confirmed to have internet connection, remove the SIM card from your phone.
- Insert the activated SIM card into the tracker.
3.2 Turn On the Tracker
- Charge the device for approximately 1 hour before first use.
- The yellow and blue indicator lights will start flashing as the device searches for network and GPS signals.
- Place the device in an area with good reception (e.g., near a window or outdoors) and wait about 5 minutes for both lights to become constant. If the yellow light continues to flash, move to a different location.
- When a GPS signal is acquired, the device will obtain a GPS location. Otherwise, it will use LBS (Location Based Service).
3.3 Setting APN (Access Point Name)
The APN settings are crucial for internet connectivity. You will need your SIM card's APN information from your provider.
- From another phone number, send an SMS command to the tracker's SIM card number.
- If your SIM card's APN has no username or password: Send
8030000 [APN](e.g.,8030000 everywhere). The tracker will reply with "SET OK". - If your SIM card's APN has a username and password: Send
8030000 [APN] [APN user] [APN pass](e.g.,8030000 everywhere eesecure secure).
Note: APN settings vary by SIM card provider. Adjust the command according to your specific APN details.
3.4 Setting GPRS Mode
- Send the SMS command
7100000to the device. - Wait approximately 30 seconds. Both blue and orange lights should remain ON, indicating the device is active and ready for online tracking.
- Log in to the SinoTrackPro web platform or mobile app. Your username is the tracker's ID number (found on the product label), and the default password is
123456.
Video 3.1: An instructional video demonstrating the unboxing, SIM card insertion, charging, and initial setup steps for the SinoTrack ST-905L GPS Tracker.
4. Operating Instructions
4.1 Real-Time Tracking
Once set up, you can track your device in real-time:
- Mobile App: Download "SinoTrackPro" from the App Store (iOS) or Google Play (Android). Log in with your device ID and password.
- Web Platform: Visit sinotrackpro.com and log in.
- SMS: Send specific SMS commands to receive location information via text message.

Figure 4.1: The SinoTrack tracking platform allows managing multiple devices from a single account, ideal for fleet managers.
4.2 Working Modes
The ST-905L offers three working modes to optimize battery life:
- Work Mode (A): The tracker works all the time. Battery life is approximately 2-3 days.
- Move Mode (B): The tracker works only when it is moving. Battery life is approximately 1 week.
- Standby Mode (C): The tracker is in standby and can be activated by SMS or call. Battery life is approximately 2 weeks.

Figure 4.2: Illustration of the three working modes (Work, Move, Standby) and their respective battery durations.
4.3 Voice Monitor Function
The device supports voice monitoring:
- To activate, send SMS command
66to the tracker's SIM card number from a pre-set control number. The tracker will call back the control number, allowing you to hear sounds around the device. - Alternatively, if you call the SIM number in the device, it will automatically pick up, enabling voice monitoring.
4.4 History Route Playback
You can view the historical routes of the tracker via the web platform or mobile app. This feature allows you to review past movements and activities of the tracked vehicle.
4.5 Geo-Fence and Alarms
The SinoTrack ST-905L supports various alert functions:
- Geo-Fence: Set up virtual boundaries, and receive alerts when the tracker enters or exits these areas.
- Overspeed Alarm: Get notifications if the tracked vehicle exceeds a pre-set speed limit.
- Shocking Alarm: Receive alerts if the device detects unusual vibrations or impacts.
5. Maintenance
- Charging: Ensure the device is regularly charged using the provided charging cable to maintain optimal performance.
- Waterproof Seal: While waterproof, ensure the charging port cover is securely closed to maintain its water resistance.
- Cleaning: Clean the device with a soft, dry cloth. Avoid using harsh chemicals or abrasive materials.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.

Figure 5.1: The ST-905L features a built-in 3.7V 5000mAh Li-ion battery, providing extended standby time.

Figure 5.2: The tracker is equipped with 5 powerful magnets for secure, no-installation mounting on metallic surfaces.
6. Troubleshooting
If you encounter issues with your SinoTrack ST-905L, refer to the following common problems and solutions:
- Device Not Online:
- Ensure the SIM card is activated and has a sufficient data plan.
- Verify the APN settings are correct. Send
RCONFvia SMS to the device to check its current settings. - Confirm the IP and Port settings match those provided in the user manual.
- Check that the device is in GPRS working mode.
- Move the device to an area with better network signal.
- Inaccurate Location:
- Ensure the device has a clear view of the sky for optimal GPS signal reception.
- In indoor or signal-obstructed areas, the device may rely on LBS, which is less accurate than GPS.
- Voice Monitor Not Working:
- Ensure the control number is correctly set up for SMS commands.
- Verify the SIM card in the tracker has calling capabilities.
For any persistent issues or further assistance, please contact SinoTrack customer service.
7. Specifications
| Attribute | Value |
|---|---|
| Product Dimensions | 3.74 x 2.83 x 0.86 inches |
| Item Weight | 10.2 ounces |
| Item Model Number | ST-905L gps tracker |
| Batteries | 2 Lithium Polymer batteries required |
| Connectivity Technologies | GPS, LTE, GSM |
| Special Features | Waterproof, Magnetic, No installation |
| Supported Application | SinoTrack PRO (iOS, Android, Web APP) |
| Specific Uses For Product | GPS tracker, Real Time Tracking, SMS Alert Notification, Geo-Fence, Location History, Rechargeable |
| Manufacturer | SinoTrack |
| Country of Origin | China |
| Date First Available | June 30, 2022 |
8. Warranty and Support
SinoTrack offers a 30-day no-questions-asked return policy for your peace of mind. Additionally, the SinoTrackPro tracking platform is provided for lifetime use without subscription fees.
Should you encounter any problems or require assistance with your SinoTrack ST-905L GPS Tracker, please do not hesitate to contact SinoTrack customer service. Our team is dedicated to providing support and resolving any issues you may have.





