1. Product Overview
The COMTEC ZERO 500M is a high-sensitivity GPS mirror type radar detector designed to enhance driving awareness by providing alerts for various traffic control devices and regulations. It integrates advanced GPS and radar detection technologies into a sleek, rearview mirror form factor.
Key features include:
- Mobile Speed Enforcement Support: Detects and alerts for mobile small-scale speed enforcement devices.
- Roundabout (Circular Intersection) Alerts: Provides warnings for roundabouts to assist with navigation and safety.
- 'Zone 30' Regulation Compatibility: Alerts drivers when entering areas designated with a 30 km/h speed limit.
- Multi-Satellite GPS Reception: Supports GPS, GLONASS, Michibiki (QZSS), and GAGAN satellite systems for improved positioning accuracy and speed.
- OBD2 Connection Capability: Allows connection to the vehicle's OBD2 port (optional adapter required) to display up to 74 types of vehicle information and maintain accurate vehicle position even in areas with poor GPS signal, such as tunnels.
- Half-Mirror Design: The LCD display can be turned ON or OFF. When OFF, the unit functions as a full rearview mirror. Special mirror processing enhances night visibility.
- Automatic LCD Rotation: The display automatically rotates 180 degrees, allowing flexible installation for both left-hand and right-hand drive vehicles.
- Free GPS Data Updates: Monthly free updates for GPS data are available.
2. Setup and Installation
Follow these steps to properly install your COMTEC ZERO 500M radar detector:
- Mounting the Unit: Securely attach the ZERO 500M to your vehicle's existing rearview mirror using the provided mounting clips. Ensure it is firmly in place to prevent shaking during driving.
- Power Connection: Connect the provided power cord to the unit and then to your vehicle's 12V power outlet (e.g., cigarette lighter socket). Route the cable carefully to avoid obstructing your view or interfering with vehicle controls.
- Optional OBD2 Connection: If you wish to utilize the OBD2 features, connect the optional OBD2 adapter (sold separately) to your vehicle's OBD2 port and then to the ZERO 500M. Refer to the OBD2 adapter's compatibility chart on the manufacturer's website to ensure your vehicle is supported.
- Adjusting Display Orientation: The unit features an automatic LCD rotation function. If the display appears upside down after installation, simply rotate the main unit 180 degrees, and the display will adjust automatically. This allows for flexible mounting in various vehicle types, including left-hand drive vehicles.

Image: The COMTEC ZERO 500M unit installed on a rearview mirror, displaying various vehicle metrics and radar scan information.

Image: Illustration demonstrating the automatic 180-degree rotation of the LCD display, allowing for flexible mounting regardless of the unit's physical orientation.
3. Operating Instructions
The ZERO 500M offers various display modes and alert functions to assist you during driving.
3.1. Power ON/OFF
The unit will power on automatically when the vehicle's ignition is turned on and power is supplied. It will power off when the ignition is turned off.
3.2. LCD Display Modes
The unit supports three main display patterns, with up to 74 display items available when connected via OBD2:
- Main/Mini Meter: Divides the screen to show main information and a mini meter.
- 3-Meter Display: Shows three items in a meter format.
- Text List: Displays information as a list of text.
You can select your preferred display items and patterns through the unit's menu settings.

Image: Various selectable standby screens, including Main/Mini Meter, 3-Meter Display, and Text List, illustrating the flexibility in information presentation.
3.3. Half-Mirror Functionality
The LCD display can be toggled ON or OFF. When the LCD is OFF, the unit functions as a full rearview mirror, providing an unobstructed view. This can be useful for reducing visual distractions or for personal preference.

Image: A comparison showing the unit with the LCD display ON (left) and OFF (right), demonstrating its functionality as a full mirror when the display is off.
3.4. Alert Functions
The ZERO 500M provides timely alerts for various situations:
- GPS Point Alerts: Alerts for fixed-point speed cameras, mobile speed enforcement zones, roundabouts, and 'Zone 30' areas.
- Radar Detection: Detects radar signals from speed enforcement devices.
- Auto Mode: Automatically switches detection modes between general roads and expressways to minimize unnecessary alerts.

Image: Examples of diverse warning screens, including 3D graphic displays for approaching enforcement points at 2000m, 1000m, 500m, and close proximity, along with smart warning displays for OBD2 information.
3.5. Radar Cancel Point Detection
The unit can automatically identify locations that frequently trigger false radar alarms (e.g., automatic doors). You can register these as 'radar cancel points'. When you pass a registered point again, the alarm will be muted to prevent unnecessary alerts.
3.6. Opposing Lane Radar Cancel Function
When radar waves from opposing lane speed enforcement devices or H-systems are detected, the unit automatically recognizes them as opposing lane radar and mutes the alert.
4. Maintenance
To ensure optimal performance and longevity of your COMTEC ZERO 500M, follow these maintenance guidelines:
- GPS Data Updates: Regularly update the GPS data. COMTEC provides free monthly updates. Visit the official COMTEC website to download the latest data and follow the instructions for updating your device. Keeping the data current ensures accurate alerts for new enforcement points and regulations.
- Cleaning: Use a soft, dry cloth to clean the unit's screen and body. Avoid using abrasive cleaners, solvents, or chemical sprays, as these can damage the display or casing. For stubborn smudges, lightly dampen the cloth with water.
- Storage: When not in use for extended periods, store the unit in a cool, dry place away from direct sunlight and extreme temperatures.
5. Troubleshooting
If you encounter issues with your COMTEC ZERO 500M, refer to the following common problems and solutions:
- Unit Does Not Power On:
- Check if the power cord is securely connected to both the unit and the vehicle's 12V power outlet.
- Ensure the vehicle's ignition is ON.
- Verify that the 12V power outlet is functioning correctly (e.g., by testing with another device).
- Frequent False Alarms:
- Utilize the Radar Cancel Point Detection feature to register locations with recurring false alarms.
- Ensure the unit is in Auto Mode, which helps differentiate between general roads and expressways to reduce unnecessary alerts.
- Check for any nearby devices that might emit similar frequencies (e.g., automatic doors, other vehicle accessories).
- GPS Signal Not Acquired or Lost Frequently:
- Ensure the unit has a clear view of the sky. Obstructions like tall buildings, tunnels, or dense foliage can interfere with GPS reception.
- Verify that the GPS data is up-to-date. Perform a free monthly update from the COMTEC website.
- If connected via OBD2, the unit should maintain vehicle position even with temporary GPS signal loss.
- Display Text is Difficult to Read:
- Adjust the display brightness through the unit's settings.
- Experiment with different display modes (Main/Mini Meter, 3-Meter Display, Text List) to find one that is most readable for you.
- Mirror Shakes or Vibrates During Driving:
- Ensure the mounting clips are securely fastened to your rearview mirror.
- Check if the rearview mirror itself is stable.
If the problem persists after attempting these solutions, please contact COMTEC customer support.
6. Specifications
| Feature | Specification |
|---|---|
| Manufacturer | COMTEC |
| Model Name | ZERO 500M |
| Product Dimensions (D x W x H) | 1.78 x 30 x 8 cm (18 x 300 x 80 mm) |
| Product Weight | 335 g |
| Voltage | 12 Volts |
| Frequency Band | 34.7 GHz |
| Display Type | 3.0-inch TFT LCD |
| Power Source | Power cord type |
| GPS Data Updates | Free monthly updates |
| Reception Bands | 18 bands |
| Enforcement Point Data | Over 39,000 points |
| Sensors | G-sensor |
| OBD2 Compatibility | Yes (optional adapter required, vehicle specific) |
7. Warranty Information
For detailed warranty information regarding your COMTEC ZERO 500M, please refer to the warranty card included with your product or visit the official COMTEC website. Warranty terms and conditions may vary by region and purchase date.
8. Customer Support
If you require further assistance, have questions about your product, or need technical support, please contact COMTEC customer service. Contact details can typically be found on the official COMTEC website or in the product packaging.
For online resources, visit the Official COMTEC Store or the manufacturer's main website.




