brand new and high quality Features: 1. A power management system with a core processor; 2, can display the battery voltage (to prevent the use of batteries that are deficient in electricity, 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-start state); 4, battery clip anti-reverse for protection (the digital tube does not light after the reverse connection, no power); 5, over-current for 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; Three major protections: 1. Battery loss for protection; 2. Battery clip anti-reverse for protection; 3. Overcurrent for protection; Three major instructions: 1. Connect the positive and negative poles of the battery clip correctly. The digital tube will light up and display the value. If it is reversed, the digital tube will not light up. 2. If the OBD interface is properly connected, the red LED will light up, if the connection is unsuccessful, the red LED will not light up; 3. Voltage and current switching instructions. The Bluetooth-compatible LED is on, indicating that the current digital tube is displaying current data, and the blue LED is not lit, indicating that the current digital tube displays voltage data. Battery change process description One: The battery clip is reliably clamped on the positive and negative poles of the spare battery (the red clip is connected to the positive poles and the black is connected to the negative poles). If the connection is correct, the digital tube will display the number (Bluetooth-compatible LED is on - display current, blue LED is off - display voltage). Color: Transparent Material: Plastic+Metal Total Length: Approx. 1.5M/59inch.Line Length:1.2M/47.2inch Type:Standard version/digital display version Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1x OBD Battery Replacing Tool