Built-in Car USB Adapter for Stable Power and Reliable Startup
Automatically Switch to display the time
When your vehicle is stopped, the HUD will automatically switch to display the time.
Note: Please make sure to set the correct time zone in advance.
MPH & KM/H Switchable
Easily switch speed units for different regions
Keep your eyes on the road, not the dashboard
K4 focuses on one thing—displaying your speed clearly and reliably, helping you stay safe on the road
Tips: Clean the dashboard and windshield before installation to ensure proper adhesion
Powered by USB · No OBD · No Setup
Does this HUD display speed in KM/H or MPH?
The K4 supports both MPH and KM/H. You can easily switch the speed unit in the device settings to match your driving preference or regional requirements.
Is the speed accurate?
Yes. The device uses a high-precision GPS module to measure real-time speed. It also includes a speed calibration function so you can fine-tune the display to match your vehicle dashboard if needed.
Can I adjust the brightness?
Yes. The K4 features adjustable brightness, making the display comfortable to read during both daytime and nighttime driving.
Will it drain my car battery?
No. The device uses low power consumption and is powered through a USB connection, so it will not drain your vehicle battery.
Can I move the reflective film after installing it?
No. The reflective film is designed for one-time installation. Once it is applied and removed, it may lose its adhesive and clarity. For best results, we recommend choosing the installation position carefully before applying the film.
Built-in Car USB Adapter for Stable Power and Reliable Startup
Automatically Switch to display the time
When your vehicle is stopped, the HUD will automatically switch to display the time.
Note: Please make sure to set the correct time zone in advance.
MPH & KM/H Switchable
Easily switch speed units for different regions
Keep your eyes on the road, not the dashboard
K4 focuses on one thing—displaying your speed clearly and reliably, helping you stay safe on the road
Tips: Clean the dashboard and windshield before installation to ensure proper adhesion
Powered by USB · No OBD · No Setup
Does this HUD display speed in KM/H or MPH?
The K4 supports both MPH and KM/H. You can easily switch the speed unit in the device settings to match your driving preference or regional requirements.
Is the speed accurate?
Yes. The device uses a high-precision GPS module to measure real-time speed. It also includes a speed calibration function so you can fine-tune the display to match your vehicle dashboard if needed.
Can I adjust the brightness?
Yes. The K4 features adjustable brightness, making the display comfortable to read during both daytime and nighttime driving.
Will it drain my car battery?
No. The device uses low power consumption and is powered through a USB connection, so it will not drain your vehicle battery.
Can I move the reflective film after installing it?
No. The reflective film is designed for one-time installation. Once it is applied and removed, it may lose its adhesive and clarity. For best results, we recommend choosing the installation position carefully before applying the film.