1.The product has a buzzer sound prompt, and the volume is about 100 decibels. It also has an indicator light prompt.<br> 2. How to use: After plugging in the test , touch the two ends of the measured wire. If an audible and visual alarm is issued, it means that the wire is conducting, otherwise it is not conducting.<br> 3. This product has a built-in 9V battery, and the cover can be opened to replace the battery. if the red and black ends are not measured, the circuit is not conducting and there is no current consumption.<br> 4. After the measurement circuit is turned on, the loop current is about 20ma. This product is not suitable for measuring tiny electronic components, electronic circuit boards, etc.<br> Part name: 9V buzzer tester<br> note:You can test whether the cable is normal, whether the wire is normal, whether the PCB board cable is normal, or whether the product is normal.<br> Precautions: Do not use when the product is powered on or plugged in to a power source!<br> Color: As Shown<br> Material: plastic<br> Package Contents:<br> 1 x continuity tester<br> 1 x multimeter pen wire<br> 1 x red and black clip wire<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.