P10 HUD 2.2 inch Car OBD2 Smart Digital Meter with TFT LCD Multi-color, Speed & RPM & Water Temperature & Oil Consumption & Driving Distance Time & Voltage Display, Over Speed Alarm, Low Voltage Alarm, Kilometers & Miles Switching, Light Sensor Functions 1. Read the driving data of the car through the OBD2 interface of the car ECU line computer, such as vehicle speed, rotation speed, fuel consumption, water temperature and voltage, etc. 2. The driving information can be read instantaneously under the condition that the wide field of view is not shifted during the driving of the car, so as to prevent the driver from looking down at the instrument during driving and affecting safety. This product does not rewrite any data in the ECU. 3. Performance test: (1). Acceleration test: 100km acceleration refers to the acceleration time from 0 to 100kmh, which is a test of vehicle power. (2). Brake test: The time and distance used after the brake stops when the vehicle speed exceeds 100 is to test the performance of the brake. 4. Fault diagnosis settings: (1). Scan the fault code: scan whether the car is faulty, and display the fault information (2). Clear fault code: When the car has a fault code displayed, short press the dial button to clear the fault code (3). Read data stream: display all data in the car engine 5. Reminder: Please disconnect if you don''t drive for more than a week. Because the OBD device is a normal electric car battery theoretical standby for 1 month, it is recommended to unplug the OBD device when the car is not used for a long time due to different vehicle conditions.