1. The product features a buzzer sound alert with a volume of approximately 100 decibels and includes an indicator light. 2. How to use: After inserting the test leads, touch the two ends of the wire being tested. If an audible and visual alarm sounds, the wire is conducting; otherwise, it is not. 3. This product has a built-in 9V battery; the cover can be opened to replace the battery. When the red and black test leads are not connected to a circuit, there is no current flow or power consumption. 4. When the measurement circuit is closed, the loop current is approximately 20mA. This product is not intended for testing small electronic components or printed circuit boards. Part name: 9V Buzzer Tester Note: This tool can be used to test cable continuity, wire integrity, or general product functionality. Precautions: Do not use this tester on live circuits or when the device under test is powered on. Color: As shown Material: Plastic Package Contents: 1 x Continuity Tester 1 x Multimeter Test Lead 1 x Red and Black Clip Lead The package includes only the items listed above; other accessories are not included. Note: Lighting conditions and monitor settings may cause slight variations in color between the image and the actual item. Measurement error allowance: +/- 1-3 cm.