FEATURES: Eliminates humming and buzzing due to ground loop issues Filters out DC current in the signal path Connectors: 3.5mm Male, 3.5mm Female Passive in-line device,stereo audio Close to perfect response of +/- 0.03 dB from 2-20,000 Hz Compact and Portable : Being so mini and light-weight, this little gadget does not take much space and can be easily taken . Eliminating Buzzing Noise : Completely eliminating the buzzing noise in some car speakers / home stereo when using the Bluetooth receiver. Utilizes proprietary audio for a 1.3 dB gain Audio signals can be transmitted along our isolator without distortion. Material: ABS colour: black Package Contents: 1 x Audio Noise Isolation Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.