Features: The product includes a buzzer sound prompt with a volume of approximately 100 decibels and an indicator light prompt. 1. How to use: After inserting the test, touch the two ends of the wire being tested. If an audible and visual alarm sounds, the wire is conducting; otherwise, it is not conducting. 2. This product has a built-in 9V battery, and the cover can be opened to replace the battery. If the red and black probes are not connected to a circuit, there is no current consumption. 3. When the measurement circuit is closed, the loop current is approximately 20mA. This product is not suitable for testing small electronic components or electronic circuit boards. Specifications: Part name: 9V buzzer tester You can test whether a cable is intact, whether a wire is functional, or whether a PCB board trace is continuous. Precautions: Do not use when the device under test is powered or connected to a power source! Please verify the item meets your requirements before purchase. Tips: Product design may vary slightly between batches. Minor differences in appearance or color may occur but do not affect functionality. Color: As shown Material: Plastic Package Contents: 1 x Continuity Tester Only the items listed above are included; other items are not part of the package. Note: Lighting effects and monitor settings may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.