1. A power management system with a core processor; 2, can display the battery voltage (to prevent the use of batteries are deficient in , can not reach the purpose of continuous battery replacement); 3, can display the current (can be used for leakage detection, can also understand the quiescent current of the car in the non- state); 4, battery clip anti-reverse protection (the digital tube does not light after the reverse connection, no power); 5, over-current protection (with 5 amp insurance); Voltage and current are automatically cycLED. Four major functions: 1, continuously change the car battery; 2, car leakage detection; 3, display voltage; 4, display current; major protections: 1. Battery loss protection; 2. Battery clip anti-reverse protection; 3. Overcurrent protection; major instructions: 1. Connect the and negative poles of the battery clip correctly. The digital tube will and display the value. If it is reversed, the digital tube will not . 2. If the OBD interface is properly connected, the red LED will , if the connection is unsuccessful, the red LED will not ; 3. Voltage and current switching instructions. The Bluetooth LED is on, indicating the current digital tube is displaying current data, and the blue LED is not lit, indicating the current digital tube displays voltage data. Battery change process description One: The battery clip is reliably clamped on the and negative poles of the spare battery (the red clip is connected to the and the black is connected to the negative ). If the connection is , the digital tube will display the number (Bluetooth LED is on - display current, blue LED is off - display voltage). Color: Transparent Material: ABS Contents: 1 * OBD Battery Replacing Tool Only the above content, other are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.