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Speedometer & Alarm Display

Speedometer & Alarm Display

Regular price $75.99 USD
Regular price Sale price $75.99 USD
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Introducing the GEYIREN A900 Auto HUD Display Car Projector Alarm – the ultimate electronic accessory for your vehicle, ensuring safe and informed driving experiences. With advanced features and user-friendly design, this HUD display offers unparalleled convenience and clarity on the road.

Important Considerations:

  • Pre-2004/2008 Compatibility: Ensure compatibility with your vehicle's protocol, especially for US (pre-2004) and European/Asian (pre-2008) automakers.
  • Testing and Returns: Test the device upon receipt and contact us promptly for returns if necessary, ensuring satisfaction and hassle-free transactions.
  • Special Vehicle Compatibility: Note potential compatibility issues with electric, diesel, hybrid vehicles, pickup trucks, and passenger cars.

Key Features:

  • OBD System Compatibility: Compatible with petrol cars, not diesel or electric vehicles.
  • Over-Speed Alarm: Automatically alerts to prevent speeding, promoting safe driving practices.
  • Customizable Alarm: Set your preferred over-speed threshold (default: 150km/h).
  • Safety Driving Focus: Reduces distractions and enhances focus on the road, preventing accidents.
  • Voltage and Temperature Alarms: Alerts for high/low voltage and high water temperature, ensuring vehicle health.
  • Light Sensor: Automatically adjusts brightness for optimal visibility in any environment.
  • Double Image Prevention: Utilize reflective film for clear windshield projections, eliminating double reflections.

Additional Functions and Features:

  • HUD Main Display: RPM, water temperature, voltage, single driving distance, low voltage/high water temperature alarms, and more.
  • Plug and Play Connectivity: Works with any OBDII or EUOBD capable vehicle.
  • HD Display: 3.5-inch screen with multi-color design for clarity and readability.
  • Nano-technology: Eliminates double reflections, enhancing visibility.
  • Auto Power On/Off: Syncs with vehicle ignition, conserving battery life.
  • Brightness Adjustment: Five-level brightness settings for optimal visibility.
  • Display Interfaces: Choose from six different display interfaces to suit your preferences.


  1. Insert OBD Socket Connector: Connect the OBD socket connector.
  2. Secure Wiring: Route the wire through the A-pillar sealing strip.
  3. Connect Interface: Connect the HUD to the OBD interface and position it suitably.

Package Includes:

  • 1 x HUD Body
  • 1 x OBD Data Line
  • 1 x Reflection Film
  • 1 x Anti-slip Mat
  • 1 x English Manual


  • Inaccurate Speed: Adjust speed unit and parameters for accurate readings.
  • Setting Speed Alarm: Customize over-speed alarm threshold.
  • Switching Speed Unit: Easily switch between KM/H and MPH.
  • Screen Issues: Troubleshoot power and connectivity to resolve display problems.
  • Resetting Settings: Perform a reset by following specific instructions.

Upgrade your driving experience with the GEYIREN A900 Auto HUD Display Car Projector Alarm. Stay informed, stay safe, and enjoy the road ahead with confidence.



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