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 audible and visual alarm sounds, the wire is conducting; otherwise, it is not conducting. This device has a built-in 9V battery; the cover can be opened to replace the battery. When the red and black probes are not in use, the circuit is open and there is no power consumption. When the measurement circuit is active, the loop current is about 20mA. This product is not intended for testing small electronic components or printed circuit boards. Product Name: 9V Buzzer Tester Note: You can test cables, wires, PCB board connections, or general product continuity. Precautions: Do not use while the product is powered on 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 Only the items listed above are included; other items are not part of this package. Note: Lighting effects and monitor settings may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm.