After replacing the storage battery, release the red clip of the tool. If the tool still beeps, it indicates the battery has been replaced successfully. If there is no sound, it may indicate a blown fuse. Using this simple tool when replacing your car battery helps prevent power loss and related issues. The power management system with a core processor displays battery voltage to avoid using low-power batteries, ensuring replacement can be done without power interruption. It also displays current, which can be used for leakage detection and monitoring static current in the vehicle's startup state. Battery clamp features reverse connection protection; a red light will illuminate if connected incorrectly. Includes overcurrent protection with a built-in 5A fuse. Instructions: If the digital display does not show readings after connecting to the battery, reconnect the clamps securely. If the car battery is severely depleted, connecting the tool may cause a high current draw, potentially reaching several or even tens of amperes. Since the tool has a 5A fuse, this could blow the fuse and prevent successful battery replacement without power disconnection. The correct method is to start the vehicle, allow the battery to fully charge, then proceed with the replacement. Note: Installation guide not included. Professional installation is strongly recommended. Please verify the product specifications to ensure compatibility. Product design may vary slightly between batches, including minor color differences, which do not affect functionality. Color: As shown in photo Material: ABS Package Contents: 1 x Detection tool