Eliminates buzzing noise caused by ground loops in some car speakers and home stereo systems. This noise isolator improves o clarity by reducing unwanted electrical interference without requiring an external power supply. Compatible with any portable device featuring a 3.5mm jack for use in cars or home stereos. Compact design ensures minimal space usage and easy portability. Item type: Ground Loop Noise Isolator Interface: 3.5mm Frequency response: 20Hz-20kHz Input: Stereo Size: 59 x 20 x 18mm Material: Plastic Color: Black Package Contents: 2 x Ground Loop Noise Isolators Note: Light reflection and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3cm.