Why do some vehicles have noise and electric current noise? Because the OBDPEAK product is connected to car power supply A and the audio system is connected to power supply B, the voltage is different, but the ground wire is the same; And the AUX audio cable connects the OBDPEAK product to the car audio system, causing power supply A and power supply B to be connected to each other, causing current to flow through, which can cause noise! Audio isolator function: 1. The operation is very simple: easy to use, just plug and play, no battery required. Compact and portable, this noise isolator does not take up too much space and is easy to remove. 2. Clear music enjoyment: Eliminate buzzing caused by grounding circuits when using the same power source as some car speakers/home audio systems, achieving clear music enjoyment. 3. Compatible models: Suitable for any portable device with a 3.5mm audio jack when grounding issues persist, used for car audio systems and home stereos. 4. Ground Circuit Noise Isolator: This product is an audio common ground isolator that is effective in reducing noise caused by the common ground between the audio source and receiving equipment. Specification: Interface: 3.5mm audio port Colour: Black Material: ABS Line length: 30cm Product weight: 20g Product size: about 60*22*13mm/2.36*0.87*0.51inch To determine whether the noise is caused by common ground: 1. Use the headset to connect with the OBDPEAK product and the AUX (3.5mm interface) of the car . If there is no noise from the sound from the headset at this time, it can be confirmed that the noise of the car equipment is caused by the common ground. 2. Use the audio cable to connect the battery-powered OBDPEAK product (note that the OBDPEAK product should not be connected to any power source in the car, such as a telephone) to the AUX on the center console of the car, and play the music of the mobile phone, so that there is no noise. , it can be confirmed that the noise in the past is caused by the common ground. 3. Computer, power amplifier, stereo, CD: Use passive earphones to plug in the computer to hear whether there is noise, and use the mobile phone to plug in the power amplifier and stereo to audition. 4. After starting the car, the installed power amplifier has a current sound, and some models will also have the situation that the bigger the accelerator, the louder the current sound, this product can solve this problem. 5. If there is current sound between the power amplifier and the speaker or the speaker, this product can be installed between the power amplifier and the speaker. 6. If the laptop is connected to the projector and the power amplifier at the same time, there will be noise. You can connect the laptop to the power adapter or use the battery. At this time, the noise disappears when the power amplifier is unplugged, or the same noise disappears when the projector is unplugged. Then you can connect the headphone jack of the computer and the power amplifier A common ground isolator is added in between to eliminate noise. Unable to eliminate noise problems: 1. The noise caused by the non-common ground cannot be filtered by this model, such as electromagnetic interference. Be sure to confirm the source of the noise before purchasing. 2. Because everyone has different expectations for the isolation effect and different senses, some customers feel good and some customers feel bad. This product is an audio common ground isolator, which is effective for the noise caused by the common ground of the audio source and the receiving equipment.