[voltage current display] car battery change memory works with any 12V DC power source, including a running , DC 12V lead-acid battery, or other automotive DC 12V power outlet. It displays both voltage and current, red for voltage and blue for current. [Leakage Detection]Connect the protector to the full spare battery and vehicle OBD port, the screen display current and voltage data. Unplug the fuses in the car fuse box one by one, if the current suddenly becomes low, it proves that this fuse may have leakage. Then compare the car circuit diagram, find the circuit or electrical appliance connected to this fuse, you can find out the leakage situation. [Protection Function]3 amp fuse built into the memory saver, better reliable on overload protection. Detection of abnormal battery voltage and current sends an alert and the screen flashes. Current clamp anti-reverse connection protection, reverse connection after the digital tube does not light, not power. [Car Memory Saver]Protect the vehicle, when replacing the car battery, it can be used to supply power to the vehicle ECU and prevent the vehicle ECU data from being lost. Note: In the process of replacing the battery, the whole process to that the vehicle power off, no electrical work, to avoid generating instantaneous excessive current. Colour:black Material:ABS Package Contents: 1 * Car OBD II Battery Saver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.