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Description:
This product is an audio common ground isolator, which effectively suppresses the noise caused by the common ground for the sound source and the receiving device.
So what is the common ground? To put it simply, the ground point of the two electrical appliances is not at the same point. Due to the difference in grounding resistance, noise is transmitted into the electrical equipment through the ground wire to form interference.
Because the grounding points of the two devices are different, it is possible to generate common ground noise.
The noise is mainly reflected in the car audio, that is, there is an audio interference, like the whistling sound, the frequency of this noise will change with the engine speed.
Therefore, this product can only eliminate the noise and current sound generated by the common electricity, and can not eliminate the noise caused by other reasons, so you need to confirm the source of the noise yourself.
Determine if noise is caused by common ground:
1. Use the earphone to connect with the car MP3 and car navigation AUX (3.5mm interface). If the sound heard from the earphone is no noise at this time, it can be confirmed that the noise of the car device is caused by the common ground.
2. Use the audio cable to connect the battery-powered mobile phone, or MP3 (note that the mobile phone, MP3 is not connected to any power source on the car, such as a telephone), and the AUX of the car center console, and play the music of the mobile phone. Noise can confirm that the noise was caused by the common ground.
3. Computer, amplifier, stereo, CD: Use a passive headset to plug in the computer to hear if there is noise, use the phone to plug in the amplifier, audio audition, if there is no noise, the basic judgment is caused by the common ground.
4. After starting the car, the installed amplifier has a current

Package Included:
1PC*XH-M372 Stereo Audio Isolator

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Domestic
We believe you need to get your purchases as quick as possible. As a general rule your item will be shipped within 24 hours of you purchasing it. We pack and post from Tuesday to Sunday (Mondays we are closed) but definitely get all our mail off to the post office first thing Monday morning for you. Mail gets picked up at 12pm so chances are if you buy before lunchtime your item will leave the same day.

International
Same as above but understand that depending on what part of the world you are from it does take a little longer to send, delivery can be from 7-15 working days. Also other factors to take into consideration are quarantine and customs regulations in your country. It is also a consideration that customs duties and GST/VAT may be payable at the buyers expense.

Combined Postage (for items with shipping charges):
We are more than happy to combine postage, just use the Buy it Now function in eBay (but DO NOT PAY after purchasing each item) to buy all the products you need, when you have finished request a combined invoice, we will base the shipping cost on the size, weight and your location.

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For anything problem about product, price, shipping or order status, pleasecontact us via eBay message.Just contact us using the " Ask the seller a question" link on eBay.
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Return Policy

We believe our items are so outstanding. We are convinced you will be happy with your Purchase.
If you do not satisfy with our items. Please simply return to us within 30 Days in original condition. Just pay for the returned postage. Then we can issue full refund to you after the returned item arrived at our warehouse.
Please include your eBay ID and item number with any email requests.