Features: Speed alarm, fatigue driving reminder function, improve driving safety. Use car USB (5V) or cigarette lighter to USB power supply, real power consumption. USB or cigarette lighter is short-term power, the car will be powered off when the car is turned off, and there is no power stealing phenomenon, while OBD is long-term power. Using 10 Hz high refresh rate GPS + Beidou dual-mode chip, the refresh rate is 10 frames per second, and the vehicle speed is refreshed quickly without delay. Low-power chip, non-destructive standby completely solves the problem of high power consumption! Intelligent switch machine, start and close with the car. Fully automatic photosensitive, adaptive brightness adjustment, clear enough during the day and not dazzling at night. Specifications: Material:ABS Size:Approx.8.6x3.7x1.6cm/3.38x1.45x0.62inches Color:Black/White Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x M1 Heads Up Display 1x USB Cable 1x Reflective Film 1x Manual 1x Non-slip Double-sided Stickers