Features
Multi Interfaces: The 2″ LED screen can display speed, number of satellites and driving direction. Switch between these interfaces just by one key, easy to operate, convenient for driving.
GPS + Beidou Dual Position System: Built-in GPS and Beidou dual-mode chip can search satellites of up to 12, ensuring more accurate positioning data.
Two Alarm Functions: Supports Over Speed Alarm and fatigue driving reminder, improving driving safety.
Color-changing Ambient Light: This HUD features color-changing ambient light, which can be turned off. You can choose a fixed color, or let it vary automatically from blue, green, red to purple.
No Speed Skipping: The speed changes coherently and smoothly.
Universal HUD: This car HUD is suitable for all models such as truck, bus, fuel car, etc.
Easy Installation: Mount it on the windshield by the suction cup, or simply place it on the console. The mini HUD won’t block your sight.
Self-adaptive HD LED Screen: The HD LED screen can naturally vary its brightness with the environment to provide soft and not dazzling light at night, so you can read the number more at ease.

Specifications
Brand: MAXCOOL
Type: Head-Up Display
Color: Black
Material: ABS+PC
Resolution: HD
Input signal: GPS
Picture tube: LED
Screen Type: LED
Size: 52 x 52mm / 2.03 x 2.03 inch
Screen Size: 2.2 inch
Applicable models: Universal
Warranty: 1 year
Speed unit: KM/H km MPH mile

Package include
1 x Head Up Display
1 x USB Cable
1 x Suction Cup
1 x Non-slip mat
1 x User Manual

G4 GPS Speed Meter Troubleshooting
The screen without any display, and no power. Check whether the USB cable is damaged, replace the USB cable for testing, and prohibit the use of voltage higher than 5V for power supply.
Without car Speed: After HUD power-on, the satellite icon flashes will start to find the satellite. Please drive the car on the road. It will work after it stops flashing.
Inaccurate Speed: First check the speed unit is correct or not, including KM/H and MPH. Steps to switch speed units: After the HUD is displayed normally, press and hold the wheel button vertically for 3 seconds to enter item 1 (1-7), then toggle the wheel button to the left or right to switch to item 5, press the wheel button vertically to enter the speed unit setting, toggle the wheel button to the left or right to adjust to the speed unit you want (“0” for kilometers, “1” for miles), and finally press and hold the wheel button vertically for 3 seconds to save and exit. The car manufacturers usually make the dashboard speed 5-7% higher than the ECU. The international standard is based on satellite data (if the dashboard shows 100, and the device shows 105, change the default value to 102).
Driving direction display error: After the vehicle speed exceeds 5KM/H, the direction can be displayed normally.
Speed is still displayed after the car stops: Under the underground parking lot, tunnel, under the overpass, there will be unstable satellite drift when there is obstruction.
Turn off the buzzer: Push left for 2 seconds to turn off the buzzer, do it again to turn on.