Material : ABS Packaging: 1pc Size: 2/3M Color: Black Audio input: stereo Frequency response: 20HZ-20KHZ Audio Interface: 3.5mm Working Principle: The working principle of this noise isolator is to achieve a clear speech, music by eliminating the current noise in some car speakers, home stereo systems. Compatible Models: Works with any portable device that has 3.5mm audio jacks, for your car audio system, home stereo, when grounding issues persist. Also used with a bluetooth receiver, bluetooth hands-free car kit in your car audio system, home stereo. It has a 3.5mm interface and is compatible with most audio devices, such as mobile phones, tablets, computers, headphones, speakers, etc., providing great convenience for users. Made of high-quality materials, it is durable, can withstand wear and tear in daily use, and ensures the long life of the product. Small size, easy to carry. No matter at home, in the office or on a trip, you can take it with you easily. Note: Due to manual measurement, please allow an error of 1-3mm. Please ensure that you do not mind before bidding. Due to the differences between different monitors, the images may not reflect the actual color of the item. Please refer to the actual image received. Thank you very much.