1. [Visualization] The small size of 2.6 inches avoids obstructing the line of sight of driving; it displays clearer information than the windshield HUD, which allows you to monitor speed more comfortably and brings more fun to your driving experience. You can choose between white and green. You dont need to put any reflective stickers on the windshield, and you can read the information directly without looking away from the road.2. [Multi-function] G1 includes multiple functions: speed, driving distance, driving direction, automatic light perception, mileage and kilometers, sound alarm switch, speeding alarm, fatigue driving reminder. The speed unit is KM/H or MPH, and the driver can switch freely according to his own habits.3. [Alarm function] Speeding alarm and fatigue driving alarm to ensure your travel safety. The default setting is 120KM/H or 120MPH. You can adjust it according to your needs. When the product detects speeding, it will beep to remind the driver.4. [Plug and Play] Powered by the car cigarette lighter. G1 shows the actual and instance speed of the GPS satellite. Compatible with all cars in the world, no matter which brand or model, because G1 is based on an internal GPS module.5. [Certified products] CE FCC RoHS certification to ensure product quality. If you have any questions about this product, please feel free to contact us. We will reply to you as soon as possible and help you solve the problem.The main functions and features of HUD:-Plug and play connection with any USB port vehicle;-Display speed, distance traveled-Show driving direction-Display auto sensitivity-Display mileage and kilometers switch, sound alarm switch-Display speeding alarm, fatigue driving reminder-Model: G1 GPS multi-function digital speedometer-Plug and play: equipped with USB cable-Display MPH or KM/h-Simple button setting-Automatically adjust the brightness through the sensor, suitable for day and night driving-Universal: Compatible with all cars, trucks, bicycles and motorcycles.(Note: When using with a bicycle, please use a USB cable to connect the power bank.)Screen size 2.4InchProduct List:Host + USB cable + non-slip mat + manual