Feature: 1. Multi‑function vehicle GPS HUD can display speed, time, in‑car temperature, altitude, support fatigue driving and overspeed alarm to ensure your driving safety. 2. The high‑definition display support automatical brightness adjustment, easy to read, intelligent recognition brightness, bright during day and soft during night. 3. Using imported chips, the satellite signal data is obtained through the GPS/for Beidou satellite dual channel module, more stable. 4. Built‑in 400mAh battery, support solar charging, long standby time, start with car, easy to use. 5. Mini cool body design, using high temperature proof material, durable and does not take up space, easy to install. 6. Suitable for all models in the market, can be applied to trucks, buses, commercial vehicles, and small cars. Specification: Item Type: HUD Display Material: ABS+PC Size: Approx. 10 x 3cm/3.9 x 1.2in Power Supply: DC5V Battery: 400mAh Solar Charging: 100mAh Altitude Error: 1-80M Working Temperature: -40℃-+80℃ Fitment: Universal Battery Model: 503030 Battery Type: Lithium Battery(Built-In) Battery Capacity: 400mAh Normal Mode: 1. Short press the left button to turn on 2. Long press of the SET key for 5S to enter the setting mode, short press is invalid. 3. Short press the right button to switch sound Set Mode: 1. Short press the left button to add 2. Short press SET key to switch settings (long press 5s to save and enter normal mode) 3. Short press the right button to decrease Main Function 1. Vehicle Speed Display 2. Time Display 3. Solar Charging 4. In-Car Temperature Display 5. Altitude Display Alarm Prompt Function 1. Overspeed Alarm 2. Hourly Reminder Function/ Half-Hour Reminder Function 3. Fatigue Driving Alarm How to Use: 1. Please place the machine in the unobstructed position of the center console in the car to ensure normal lighting for solar charging. 2. After selecting the position, put the anti-skid pad on the selected position and put the machine on the anti-skid pad. Package List: 1 x Host 1 x Data Line1 x Double-side Adhesive Tape1 x Manual Note: Please allow small error due to manual measurement. Thanks for your understanding.