Feature: 1. Eliminate the ground loop interference that may occur when the audio source is connected to the playback device. 2. Insert this audio noise filter, it can eliminate the noise of car audio system, radio, home stereo, etc, and return clean and clear music to you. 3. It is suitable for any device with a 3.5 mm jack, including smartphones, computers, or other speakers. 4. Plug the isolator directly into the car/speaker AUX port, and then plug the auxiliary cable into the audio, it can completely solve the noise problem. 5. The noise filter does not need to be charged, and there is no built in battery. The operation is extremely simple. 6. Ultra small and lightweight design, only 3.5mm, does not take up your extra space, and meets your portable needs. Specification: Item Type: Noise Isolator Material: ABS Colour: Black Function: Noise Filter Scope of Application: Suitable for Car Audio/home Stereo System. Package List: 1 x Noise Isolator 1 x 3.5mm Audio Cable1 x Manual Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.