The product features a buzzer sound alert with a volume of approximately 100 decibels and includes an indicator light. To use, after inserting the test leads, touch the two ends of the wire being tested. If an ble and visual alarm sounds, the wire is conducting; otherwise, it is not. The device has a built-in 9V battery, and the cover can be opened for battery replacement. When the red and black probes are not in contact with a circuit, there is no current draw. Once the circuit is complete, the loop current is approximately 20mA. This tool is not intended for testing small electronic components or printed circuit boards. Item Name: 9V Buzzer Tester Note: This tester can be used to check cable continuity, wire integrity, PCB trace connections, or general product functionality. Precautions: Do not use when the device under test is powered or connected to a power source. Color: As shown Material: Plastic Package Contents: 1 x Continuity Tester 1 x Multimeter Test Lead 1 x Red and Black Clip Lead Note: Light reflection and display settings may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm.