OBDII Memory Saver Connector - Reliable construction: Made with high quality copper wire and premium silicone cable for strong insulation and long service life. Includes over-current protection for safe, stable operation. - Memory saver function: Polarity-protected cable that connects to a 12-volt backup battery to provide power through the OBDII port to onboard electronics while the vehicle battery is disconnected, preventing data loss and saving the time and effort of re-coding systems. - Practical features: This connector can display voltage and current. It helps prevent using batteries with insufficient charge and supports timely battery replacement to maintain continuous power. It can also be used for leakage detection and to monitor the quiescent current of the car when not started. - Easy to use: Attach the two crocodile clips to a 12V DC backup battery; the red indicator light will come on. Then insert the plug into the car OBD port; it will emit a continuous beep. Now you can remove the old battery from the car and install a new one.