1. Introduction
Thank you for choosing the iKiKin G4S Universal Digital GPS Speedometer Head Up Display (HUD). This device is designed to enhance your driving experience by projecting essential vehicle data directly onto your windshield or displaying it on its screen. It utilizes GPS and Beidou dual-mode chips for accurate speed, time, and directional information, compatible with all vehicle types. Please read this manual thoroughly before use to ensure proper installation and operation.
2. Safety Information
- Do not attempt to adjust settings or operate the device while driving. Always pull over to a safe location before making any adjustments.
- Ensure the device is securely mounted and does not obstruct your view of the road or interfere with vehicle controls.
- Keep the device away from water, extreme temperatures, and direct sunlight for prolonged periods to prevent damage.
- Use only the provided USB cable for power. Using incompatible cables may damage the device or your vehicle's electrical system.
3. Package Contents
Verify that all items are present in your package:
- iKiKin G4S HUD Unit
- USB Power Cable
- Suction Cup Mount
- Non-slip Pad
- User Manual (this document)
4. Product Features
- Universal Plug and Play: Easy installation for all vehicles via USB, automatically syncing with engine ignition.
- Multiple Display Modes: Switch between various interfaces including speed, time, compass, and satellite count.
- Safety Alerts: Includes overspeed and fatigue driving reminders for enhanced safety.
- GPS Navigation Compass: Displays driving direction (N, E, W, S) to assist with navigation.
- Automatic Brightness Adjustment: Built-in light sensor adjusts display brightness for optimal visibility day and night.
- Real-Time Data Monitoring: Monitors vehicle speed, satellite count, and driving direction.
- KMH/MPH Switch: Easily switch between kilometers per hour and miles per hour.
- GPS+Beidou Dual-Mode Chip: Provides high refresh rate (10 frames per second) for fast and accurate speed display without delay.
5. Setup and Installation
The iKiKin G4S HUD offers flexible installation options. Choose the method that best suits your vehicle and preference.
5.1. Dashboard Installation (Recommended)
- Place the non-slip pad on a flat, clear area of your dashboard that does not obstruct your view.
- Position the HUD unit on the non-slip pad.
- Connect the provided USB cable to the HUD unit and then to a USB port or cigarette lighter car charger in your vehicle.
- Route the cable neatly to avoid interference with driving controls.
5.2. A-Pillar/Rearview Mirror Installation (Optional)
- Attach the suction cup mount to the desired location (A-pillar or near the rearview mirror) ensuring a secure grip.
- Mount the HUD unit onto the suction cup bracket.
- Connect the USB cable to the HUD unit and a power source.
- Carefully tuck the cable into gaps along the dashboard or A-pillar for a clean installation.

Image: USB powered, non-destructive installation, and accurate speed display. The image shows the HUD connected to a cigarette lighter port and displaying speed.
Video: This video demonstrates the simple USB plug-and-play installation of the G4S Digital GPS Speedometer, showing it being plugged into a car's USB interface and placed on the dashboard, then displaying speed while driving.
Video: This video illustrates the installation steps for a Heads Up Display, showing how to connect the device to the OBD2 port and route the cable for a clean setup.
6. Operating Instructions
The iKiKin G4S HUD is designed for intuitive operation with a single control button.
6.1. Power On/Off
The device automatically powers on when your vehicle starts and powers off when the engine is turned off, thanks to its USB plug-and-play design.
6.2. Switching Display Modes
Use the single control button (dial button) on the device to cycle through different display modes. These modes include:
- Speed + Compass
- Time + Compass
- Time only
- Speed + Time (automatic switch when vehicle speed is 0)

Image: G4S display screen showing vehicle speed, time, and compass display. It illustrates automatic switching time display when the vehicle speed is 0.
6.3. Unit Switching (KMH/MPH)
The device allows you to switch between Kilometers per Hour (KMH) and Miles per Hour (MPH). Refer to the detailed instructions in the included user manual for specific steps on how to change this setting using the control button.
6.4. Safety Alarms
The HUD features built-in safety alarms:
- Overspeed Alarm: Alerts you when your vehicle exceeds a preset speed limit.
- Fatigue Driving Reminder: Prompts you to take a break after a prolonged period of driving.
These alarms can be configured or toggled on/off through the device settings. Consult the included user manual for detailed instructions on setting alarm thresholds.

Image: Two alarm functions (Over-Speed Alarm, Fatigue Driving Reminder) improve driving safety. Also shows the built-in light sensing system for automatic brightness adjustment.
7. Maintenance
- Clean the device screen and body with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
- Ensure the USB port is free from dust and debris.
- Periodically check the mounting for security to prevent the device from falling during driving.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No display/Device not powering on | Loose USB connection; No power from USB port; Vehicle engine off. | Check USB cable connection; Ensure vehicle engine is running or accessory power is on; Try a different USB port or car charger. |
| Inaccurate speed reading | Poor GPS signal; Incorrect speed unit setting. | Ensure the device has a clear view of the sky for GPS signal acquisition; Verify the speed unit (KMH/MPH) is correctly set. The device may take a few minutes to acquire satellites upon startup. |
| Display too bright/dim | Automatic brightness adjustment is active or manual setting is incorrect. | The device features automatic brightness adjustment. If manual adjustment is desired, refer to the detailed user manual for instructions on overriding automatic settings. |
| Display ghosting/double image on windshield | Windshield reflection. | This is common with HUDs on some windshields. If provided, apply the reflective film to the windshield where the display is projected. |
9. Specifications
| Attribute | Detail |
|---|---|
| Model | G4S |
| Manufacturer | iKiKin |
| Item Weight | 130 g |
| Product Dimensions | 10 x 7 x 3 cm |
| Material | Metal |
| Display Style | HUD (Head Up Display) |
| Power Source | USB (5V) |
| GPS Refresh Rate | 10 Hz (10 frames per second) |
| UPC | 724873557620 |
10. Warranty and Support
This iKiKin G4S HUD is manufactured by iKiKin. For any product-related inquiries, technical support, or warranty claims, please contact the seller or manufacturer directly. Amazon's return policy typically allows returns within 30 days of receipt for most items. Please refer to your purchase documentation for specific warranty details and contact information.