This car battery diagnostic device is a tool designed to keep the memory functions of the vehicle"s computers system, o, navigation, air conditioning, and other electronic devices from being lost during the car battery replacement process. It provides temporary power by connecting to the vehicle"s onboard diagnostics port to ensure that the vehicle"s electronic devices do not lose power during the battery replacement process. It can eliminate the need to reset the vehicle"s electronic devices after replacing the battery, saving time and energy. It also improves the safety of the battery replacement by preventing damage to the vehicle"s electronic equipment caused by the battery replacement. Features: Dual Display: Dual digital display battery diagnostic instrument with voltage and current display function, support reverse connection and wrong connection protections. Dual LED Indicator: Red Light On: On behalf of a nice connection with the storage battery, the red screen will display the current voltage of the storage battery; the blue screen will display the current (no current load, 0); Blue light On: Connection to the vehicle onboard diagnostics red screen will display the current integrated voltage; the blue screen will display the realtime current generated (the premise of the loss of the vehicle battery should be lower than the voltage of the backup battery). Vehicle ECU Data Memory: When replacing the car battery, it provides power to the vehicle"s ECU and prevents the loss of the vehicle"s ECU data. Eliminates the need to reset the vehicle"s electronic equipment after replacing the battery, saving time and energy. OnBoard Diagnostics Connector: This tool is easy to use, just connect it to the vehicle"s onboard diagnostics port before replacing the battery, and then follow the normal step to replace the battery. Throughout the process, the vehicle"s electronics (digital clock, dashboard information, memory seats, stereo, antiskid system, rearview mirrors, etc.) are supplied with a constant power, thus ensuring that their data will not be lost. Quality Battery Clamps: With coarse copper wire, iron surfaces with nickelplated coating, effectively plays a role in anticorrosion and antioxidation, with high insulation, strong bite, resistance to plugging and unplugging. It can be directly inserted without wiring, which can quickly replace the car battery, which can save time and increase efficiency.  Note: This product is only suitable for 12V battery car, the leakage does not exceed 5A. Specifications: Name: Car OnBoard Diagnostics Tester Material: PC+PVC Max current: 5A Working temperature: 10 celsius to 50 celsius Error: approx. +2percent Cable length: 1.35m Package size: 170 * 105 * 45mm 6.69 * 4.13 * 1.77in Package weight: 180g 6.35ounce Packing List: 1 * Car OnBoard Diagnostics Tester Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.