Item Type: Noise IsolatorMaterial: ABSColour: BlackFunction: Noise FilterScope of Application: Suitable for Car Audio/home Stereo SystemPackage List1 x Noise Isolator 1 x 3.5mm Audio Cable1 x ManualPlease note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.1Eliminate the ground loop interference that may occur when the audio source is connected to the playback device. 2Insert 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. 3It is suitable for any device with a 3.5 mm jack, including smartphones, computers, or other speakers. 4Plug 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. 5The noise filter does not need to be charged, and there is no built in battery. The operation is extremely simple. 6Ultra small and lightweight design, only 3.5mm, does not take up your extra space, and meets your portable needs.